#include<stdio.h>
#include<mat.h>
void perfect_square(int n) 
{ 
    if (n < 0) {
        printf("invalideinput\n");
        return 0;
    }
    int i=1;
    while (i* i<= n) {
    printf ("%d",i* i);
    i++;
    
    }
    printf("\n");
}
int main()
{
    int n;
    scanf("%d,&n");
    perfect_square(n);
    return 0;
}