Getting NZEC error

CodeChef-DSA-learners
1

PBLM code: INPSTFIX
i m getting nzec error in codecheff idle but it is working fine in my idle.please help

cook your dish here

for t in range(int(input())):
n=int(input())
s=input()
new=“”
ind=[‘^’,‘*’,‘/’,‘+’,‘-’]
p=0
stack=[]
for i in range(0,len(s)):
if(ord(s[i])>=65 and ord(s[i])<=90):
new+=s[i]

    else:
        if s[i]==')':
            element=stack.pop(len(stack)-1)
            while(len(stack)>0 and element!='('):
                new+=element
                    
                element=stack.pop(len(stack)-1)
        else:
            if(s[i]=='('):
                stack.append(s[i])
                    
            else:
                while(len(stack)>0 and stack[len(stack)-1]!='(' and ind.index(stack[len(stack)-1])<ind.index(s[i])):
                    new+=stack.pop(len(stack)-1)
                        
                stack.append(s[i])
           
while(len(stack)!=0):
    new+=stack.pop(len(stack)-1)
    
print(new)