#include<iostream> // cin\cout\endl #include<cstdio> //scanf()\printf() using namespace std; int main(){ int a,b,c,d,e; cin>>a; e=a%10; d=(a%100-e)/10; c=(a%1000-d*10-e)/100; b=(a-c*100-d*10-e)/1000; cout<<e*1000+b*100+c*10+d<<endl; return 0; }