#include<stdio.h>

int _Inverse(int n)  
{
    int m;
    for (m=0; n>0; n/=10)
        m = m*10 + n%10;
    return m;
}

main()
{
    int i;
    for(i=100; i<=9999; i++)
        if (_Inverse(i) == i)
            printf("%d\n", i);
}