#include<iostream> using namespace std; int main(){ int a,b,c,d,e; for (a=10; a<13; ++a){ c = 8*a; d = 9*a+1; e = 9*a; b = 100*c+d; if (b>=1000 && b<10000 && c<100 && e>=100 && e<1000) cout<<a<<endl<<b<<endl<<c<<endl<<d<<endl<<e<<endl; } return 0; }