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looked = []
inpt = '})[]((([(]))(){'
count = 0;
for i in range(0, len(inpt)):
e = inpt[i]
if e =='{' or e =='(' or e =='[':
looked.append(e)
else:
if len(looked):
op = looked.pop(len(looked)-1)
if ((e == '}' and op == '{') or (e == ')' or op == '(') or (e == ']' and op == '[')):
count = count + 1
print(count)
