#include<stdio.h>
int main(){
    int a,b,c;
    scanf("%d %d %d", &a, &d, &c);
    if(a<=0 || b<=0 || c<=0 || a>=100 || b>=100 || c>=100){
        printf("Invalid Input");
    }
    else if(a==b && b==c){
        printf("Equilateral\n");
    }
    else if(a==b || b==0 || c==a){
        printf("Isosceles\n");
    }
    else{
        printf("Scalene\n");
    }
    return 0;
}