# include<cstdio> using namespace std; int main(){ int a; scanf("%d",&a); int g,s,b,q,ans; g=a/1%10; s=a/10%10; b=a/100%10; q=a/1000%10; ans = s*1+g*10+b*1000+q*100; printf("%d",ans); return 0; }