#include<iostream> using namespace std; int main(){ for (int b=0;b<=9;b++) { for (int c=0;c<=9;c++){ for (int d=0;d<=9;d++){ if((1000+100*b+10*c+d)*9==(1000*d+100*c+10*b+1)) cout<<1<<' '<<b<<' '<<c<<' '<<d<<endl; } } } return 0; }