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