#include<stdio.h>
int main()
{
    int s,v,t;
    scanf("%d",&s);
    scanf("%d",&v);
    scanf("%d",&t);
    if(s<0 || v<0 || t<0 || s>=100 || v>=100 || t>=100)
    printf("Invalis Input");
    else if(s==v && v==t)
    printf("Equilateral");
    else if(s==v || v==t || t==s)
    printf("Isosceles");
    else
    printf("scalene");
    return o;
}