#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 \n");
    }
    else if(a == b && b==c ){
        printf("Equilateral \n");
    }
    else if(a==b || b== || a==c){
        printf("Isosceles \n");
    }
    else{
        printf("Scalene \n");
    }
    return 0;
}