#include<bits/stdc++.h> using namespace std; int main(){ int x; cin>>x; int a,b,c,d; a=x/1000; b=x%1000/100; c=x%100/10; d=x%10; cout<<d<<c<<b<<a; }

#include using namespace std; int main(){ long long a,s,d,f,g,h,j,k,l; cin>>a; s=a%10; d=a%100/10; f=a%1000/100; g=a/1000; cout<<1000s+100d+f+g; }