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;
}
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