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