#include<iostream> using namespace std; int main(){/** int a,b,temp; cin>>a>>b; temp=a; a=b; b=temp; cout<<a<<" "<<b; char A; cin>>A; cout<<(A+10-30)*20/5; int a1,a2,n; cin>>a1>>a2>>n; cout<<a1+(n-1)*(a2-a1); int a,b,c; cin>>a>>b>>c; cout<<a*100+b*10+c;**/ int m,a,b,c,d; cin>>m; a=m/1000; m=m%1000; b=m/100; m=m%100; c=m/10; m=m%10; d=m; cout<<b*1000+a*100+d*10+c; return 0; }