#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");
        return 0;
    }
    
    if (a + b <= c || a + c <= b || b + c <= a) {
        printf("Invalid input");
        return 0;
    }
    
    if ( a == b && b == c) {
        printf("Equilateral");
    } 
    else {
        if (a == b || b == c || a == c) {
        printf("Isosceles");
    }
    else {
        printf("Scalene");
    }
    
    return 0;
}