diff --git a/boj/boj_28078.py b/boj/boj_28078.py
new file mode 100644
index 0000000..6817892
--- /dev/null
+++ b/boj/boj_28078.py
@@ -0,0 +1,79 @@
+from sys import stdin, maxsize, setrecursionlimit
+from heapq import *
+from bisect import *
+from collections import deque
+import random
+from itertools import combinations, permutations
+import math
+
+
+MAX = 17
+MOD = 1000000007
+setrecursionlimit(10**6)
+input = stdin.readline
+
+N = int(input().strip())
+s = [input().strip() for _ in range(N)]
+
+class Q:
+    cnt = [0, 0]
+    direction = 0 # 
+    d = deque() # 0: wall, 1: ball
+
+    def __init__(self) -> None:
+        pass
+    
+    def rotate(self, right: bool):
+        self.direction = (self.direction + 1) % 4 if right \
+            else (self.direction - 1) % 4
+        self.waterfall()
+
+    def count(self, v: int):
+        print(self.cnt[v])
+    
+    def pop(self):
+        if self.d:
+            v = self.d.pop()
+            self.cnt[v] -= 1
+            self.waterfall()
+
+    def push(self, v: int):
+        self.cnt[v] += 1
+        self.d.appendleft(v)
+        self.waterfall()
+
+    def waterfall(self):
+        if self.direction & 1:
+            pop = self.d.pop if self.direction == 1 else self.d.popleft
+            append = self.d.append if self.direction == 1 else self.d.appendleft
+            while self.d:
+                v = pop()
+                self.cnt[v] -= 1
+                if not v:
+                    self.cnt[v] += 1
+                    append(v)
+                    break
+
+
+
+def main():
+    q = Q()
+
+    for l in s:
+        query = l.split()
+        
+        match query[0]:
+            case 'push':
+                q.push(1 if query[1] == 'b' else 0)
+            case 'pop':
+                q.pop()
+            case 'count':
+                q.count(1 if query[1] == 'b' else 0)
+            case 'rotate':
+                q.rotate(query[1] == 'r')
+        # print(q.d)
+    return
+
+
+if __name__ == "__main__":
+    main()
diff --git a/main.py b/main.py
index b839e57..2c7c0cc 100644
--- a/main.py
+++ b/main.py
@@ -12,28 +12,18 @@
 setrecursionlimit(10**6)
 input = stdin.readline
 
-N, M = map(int, input().split())
-a = [list(map(int, input().split())) for _ in range(2)]
+W, H, K = map(int, input().split())
+N = int(input().strip())
+ys = list(map(int, input().split()))
+M = int(input().strip())
+xs = list(map(int, input().split()))
 
 def main():
-    wait = [(-1, 0)] # prev, val, 
-    for _ in range(N):
-        q = []
-        for (p, v) in wait:
-            for l in range(3):
-                if p == l:
-                    q.append((l, v + a[0][l]//2))
-                    q.append((l, v + a[1][l]//2))
-                else:
-                    q.append((l, v + a[0][l]))
-                    q.append((l, v + a[1][l]))
-        wait = q
-    res = 0
-    for (_, val) in q:
-        res += 1 if val >= M else 0
-    print(res)
+
     return
 
 
 if __name__ == "__main__":
     main()
+
+
diff --git a/tmp.py b/tmp.py
index 51b1221..4257ff3 100644
--- a/tmp.py
+++ b/tmp.py
@@ -1,34 +1,2 @@
-def tree_update(i,diff):
-	while i<=N:
-		tree[i]+=diff
-		i+=i&-i
-def tree_sum(i):
-	r=0
-	while i:
-		r+=tree[i]
-		i&=i-1
-	return r
-import sys
-input=sys.stdin.readline
-N=int(input())
-tree=[0]*(N+5)
-a=[0]*1000005
-b=[0]*(N+5)
-for idx,i in enumerate(map(int,input().split())):
-	b[idx+1]=a[i]
-	a[i]=idx+1
-M=int(input())
-query=[tuple(map(int,input().split()))+(i,)for i in range(M)]
-query.sort(key=lambda x:x[1])
-ans=[0]*M
-cur=0
-for i in range(1,1+N):
-	if b[i]:
-		tree_update(b[i],-1)
-	tree_update(i,1)
-	while cur<M:
-		if query[cur][1]!=i:break
-		ans[query[cur][2]]=tree_sum(query[cur][1])-\
-            tree_sum(query[cur][0]-1)
-		cur+=1
-print(*ans,sep='\n')
\ No newline at end of file
+s = input()
+print('YES' if sum([i in s for i in 'MOBIS']) > 4 else 'NO')