PROBLEM 3 bio

#include <stdio.h>
#include <string.h>
int main()
{
    char s[1000];
    int i,A,G,T,C;
    A = G = T = C = 0 ;
    gets(s);
    int len = strlen(s);
    for ( i=0;i<len;i++)
    {
        if(s[i] == 'A')  A++ ;
        if(s[i] == 'C')  C++ ;
        if(s[i] == 'G')  G++ ;
        if(s[i] == 'T')  T++ ;

    }

    printf("%d %d %d %d\n", A, C, G, T);
    return 0;
}