#include <stdio.h>
int main()
{
    int a,b,c
    scanf("%d%d%d",&a,&b,&c);
    if(a <= 0 || b <= 0 || c <= 0){
    printf("Invalid input");}
    else if(a == b && b == c){
    printf("Equilateral");}
    else if(a == b || b == c || a == c){
    printf("Isoceles");}
    else {
        printf("scalene");
    }
    return 0;
}