C :

#include<stdio.h>
int main()
{
    char s[3][3];
    while(~scanf("%c%c%c\n",&s[0][0],&s[0][1],&s[0][2]))
    {
        gets(s[1]);gets(s[2]);
        if(s[0][0]==s[2][2]&&s[0][1]==s[2][1]&&s[1][0]==s[1][2]&&s[0][2]==s[2][0]&&s[0][1]==s[2][1]&&s[1][0]==s[1][2])
            printf("YES\n");
        else  printf("NO\n");
    }
    return 0;
}

C++ :

#include<iostream>
#include<cstdio>
#include<string.h>
#include<algorithm>
#include<math.h>
#include<cstring>
using namespace std;

char a[10][10];
int main()
{
    while(cin >> a[1][1] >> a[1][2] >> a[1][3])
    {
        int flag = 1;
        for(int i = 2; i <= 3; i++)
            for(int j = 1; j <= 3; j++)
            cin >> a[i][j];
        for(int i = 1; i <= 2; i++)
        {
            for(int j = 1; j <= 3; j++)
            {
                if(a[i][j] != a[4-i][4-j])
                {
                    flag = 0;
                    break;
                }
            }
        }
        if(flag == 1)
            printf("YES\n");
        else
            printf("NO\n");
    }
    return 0;
}