UVA Problem#458

Question:

http://uva.onlinejudge.org/external/4/458.html 

Solutions :

#include<stdio.h>
#include<string.h>

char s[1000000];

int main(){
int i, l, c;
while(gets(s) != NULL){
l = strlen(s);
for(i=0; i<l; i++){
c = s[i]-7;
printf("%c", c);
}
printf("\n");
}
return 0;
}