You Want Chocolate?

Discussions Toph Problems
1

Bear Limak is very much fond of chocolate. His mom wants her son to study hard and develop his skill…

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2

What is the problem?
Why getting WA on 2nd test case???

for x in range(int(input())):
    n=int(input())
    s=input()
    l=set()
    if s=='':
        print(-1)
        continue
    print("Case %d:"%(x+1))
    for y in s:
    	l.add(y)
    l=sorted(l)
    for y in l:
        if y not in [' ','!', '"', '#', '$', '%', '&', "'", '(', ')', '*', '+', ',', '-', '.', '/', ':', ';', '<', '=', '>', '?', '@', '[', '\\', ']', '^', '_', '`', '{', '|', '}', '~']:
            print("%s - %s"%(y,s.count(y)))
    print()