#include<iostream> // cin\cout\endl #include<cstdio> //scanf()\printf() using namespace std; int main(){ int z; cin>>z; int a,b,c,d,ans; a=z%10; b=z/10%10; c=z/100%10; d=z/1000%10; ans=b*1+a*10+c*1000+d*100; cout<<ans<<endl; return 0; }