I tried to solve this test nearly 2 hours and always got WA.The problem was that numbers of "!" can be more than 20 (in 15 test). So my program with next code got wa:
char s[20]
int n;
scanf("%d %s",&n,&s);
int k = strlen(s);

i changed char s[20] to char s[100] and got ac. Admins, plz correct it.