#include<stdio.h>
int main()
{
    int abcd,n,a,b,c,d;
    //1000<=abcd<=9999
    scanf("%d",&abcd);
    d=abcd%10;
    c=abcd/10%10;
    b=abcd/100%10;
    a=abcd/1000;
    n=d*1000+c*100+b*10+a;
    printf("%d",n);
    return 0;
}