Someone please help me with my python code for https://www.codechef.com/LRNDSA02/problems/INPSTFIX

```
precedence = {'+':1, '-':1, '*':2, '/':2, '^':3}
def preced(i):
if i in precedence and stack[-1] in precedence and precedence[i]<=precedence[stack[-1]]:
return True
else:
return False
for _ in range(int(input())):
n = int(input())
s = input()
out = []
stack = []
cnt = 0
for i in s:
if i.isalpha():
out.append(i)
elif i == '(':
stack.append(i)
cnt += 1
elif i == ')':
while cnt and stack[-1] != '(':
out.append(stack.pop())
cnt -= 1
if not cnt and stack[-1] != '(':
print("improper sequence")
else:
stack.pop()
cnt -= 1
else:
while cnt and preced(i):
out.append(stack.pop())
cnt -= 1
stack.append(i)
cnt += 1
while cnt:
out.append(stack.pop())
cnt -= 1
print(''.join(out))
```

I am getting the output for all the different test-cases I checked. But for the above code I am getting WA. https://www.codechef.com/viewsolution/32188513

Please help me where/ In which test-case my program is failing…

Thanks in advance.