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