#include<stdio.h>
void main ()
{
    int a,b,c;
    a=3,b=4,c=5;
    if(all side are equal)
    {
        printf("Equilater");
    }
    else if(two sides are equal)
    {
        printf("isosceles");
    }
    else if ("all sides are different")
    {
        printf("scalene");
    }
    else
    {
        printf("invalid output");
    }
}