codechef LUCKY5 - "lucky long" solution

codechef LUCKY5 - "lucky long" : http://www.codechef.com/problems/LUCKY5

codechef LUCKY5 - "lucky long" solution :  http://ideone.com/O9tKEU

#include <iostream>

#include <cstdio>

#include <cstring>

using namespace std;

int main() {

int t, cnt;

char s[1000000];

scanf("%d", &t);

while(t--) {

scanf("%s", s);

cnt=0;

for(int i=0; i<strlen(s); i++) if(s[i]!='4' && s[i]!='7') cnt++;

printf("%d\n", cnt);

}

return 0;

}