Remember to use this editorial only when stuck, and not to copy-paste code from it. Please be respectful to the problem author and editorialist.
Submitting an official solution before solving the problem yourself is a bannable offence.

t = int(input())
for i in range(1,t+1):
    s,target = input().split()
    ans = s.find(target)
    print(f'Case #{i}: {ans}')