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