#include<iostream> #include<cstdio> using namespace std; int main(){ int a; cin>>a; int g,s,b,q; g=a%10; s=a/10%10; b=a/100%10; q=a/1000%10; int B; B=s*1+g*10+b*1000+q*100; cout<<B<<endl; return 0; }