Codeforces 443A Anton and Letters(水题)

#include <cstdio>
#include <cstring>

const int N = 1005;

int n, v
;
char s
;

int main () {
int ans = 0;
memset(v, 0, sizeof(v));

gets(s);
n = strlen(s);

for (int i = 0; i < n; i++) {
if (s[i] >= 'A' && s[i] <= 'z') {
int u = s[i] - 'A';

if (v[u] == 0)
ans++;
v[u] = 1;
}
}
printf("%d\n", ans);

return 0;
}