#include<stdio.h>
int main(){
    int a,b,c;
    scanf("%d %d %d",&a,&b,&c);
    if("all sides are equal"){
        printf("Equilateral");
    }
    if("exactly two sides are equal"){
        printf("Isoceles");
    }
    if("all sides are different"){
        printf("Scalene");
    }
    else("input contains negative integers"){
        printf("Invalid input");
    }
    return 0;
}