IP

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <ctype.h>

#define MAX 40
#define MIN 0

typedef struct{
    int Num1, Num2, Num3, Num4;
}TIp;

void ConvertIP( TIp A, char * IP ){
    int Cont ;

    Cont = 7;

    do{
        IP[Cont--] = (A.Num1 % 2) + '0';

    }while( (A.Num1 = A.Num1 / 2 ) != 0 );

    Cont = 15;

    do{
        IP[Cont--] = (A.Num2 % 2) + '0';

    }while( ( A.Num2 = A.Num2 / 2 ) != 0 );

    Cont = 23;

    do{
        IP[Cont--] = (A.Num3 % 2) + '0';
    }while( ( A.Num3 = A.Num3 / 2 ) != 0 );

    Cont = 31;

    do{
        IP[Cont--] = (A.Num4 % 2) + '0';
    }while( ( A.Num4 = A.Num4 / 2 ) != 0 );

    IP[32] = '\0';

}

int main(void){
    TIp A, B, C;
    char Mask[MAX], IP1[MAX], IP2[MAX], Flag;
    int Cont;

    while( scanf("%d.%d.%d.%d %d.%d.%d.%d %d.%d.%d.%d", &A.Num1, &A.Num2, &A.Num3, &A.Num4, &B.Num1, &B.Num2, &B.Num3, &B.Num4, &C.Num1, &C.Num2, &C.Num3, &C.Num4) != EOF ){

        for(Cont = 0; Cont < MAX; Cont++){
            Mask[Cont] = IP1[Cont] = IP2[Cont] = '0';
        }

        ConvertIP( A, IP1 );
        ConvertIP( B, IP2);
        ConvertIP( C, Mask );

        Flag = 1;

        for( Cont = 0; Mask[Cont] != '0' && Mask[Cont] != '\0' ; Cont++)
            if( IP1[Cont] != IP2[Cont] ){
                Flag = 0;
                break;
            }

        if( Flag == 1 )
            printf("S\n");
        else
            printf("N\n");

    }


    return 0;
}