#include<iostream> #include<cstdio> #include<cmath> using namespace std; int main(){ int a,b,t; for(a=1;a<=9;a++){ for(b=0;b<=9;b++){ t=a*1000+a*100+b*10+b; if(t == int (sqrt(t))*int(sqrt(t))){ cout<<t; } } } }