Matching Brackets - Toph.co - Stack

text = input()
stack = []; match = 0
for i in text:
    if i == '(' or i == '{' or i == '[':
        stack.append(i)
    elif len(stack) > 0:
        pop = stack.pop()
        if ord(i) == ord(pop)+1 or ord(i) == ord(pop)+2:
            match += 1

if match == len(text)/2:
    print('Yes')
else:
    print('No')