sequence = input()

stack = []

flag = True
for ch in sequence:
    if ch in "({[":
        stack.append(ch)
    else:
        if len(stack) == 0:
            flag = False
            break
        last_opening_bracket = stack.pop()
        pair = f"{last_opening_bracket}{ch}"
        if pair not in "(){}[]":
            flag = False
            break
if flag and len(stack) == 0:
    print("YES")

else:
    print("NO")