#include<iostream> int main(){ int a,b,c,d,e,f; scanf("%d",&a); b=a/1000; c=(a-1000*b)/100; d=(a-1000*b-100*c)/10; e=a-1000*b-100*c-10*d; f=e*1000+d*100+c*10+b; printf("%d",f); return 0; }