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