for i in range(0,T):

len=int(input())

S=int(input())

arr=array(“i”,[])

for j in range(0,len):

temp=S%10

S=int(S/10)

arr.append(temp)

arr=arr[::-1]

a = arr[0]

Y=0

for k in arr:

if k!=a:

break

Y += 1

print(Y)

I am getting a runtime error in this code even if its working. I am new to codechef so idk what’s the matter. Please help me out.