#include <stdio.h> int main() { int m, a, b, c, d; while(scanf("%d",&m)!=EOF) { if(m>=1000&&m<=9999) { a = m/1000; b = m/100%10; c = m/10%10; d = m%10; if(d==0) printf("%d\n",100c+10b+a); else printf("%d\n",1000d+100c+10*b+a); } } return 0; }