#include <stdio.h>
int main() {
    int a, b, c;
    printf("Enter the three side lengths of the triangle ( 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 == c || a == c) {
            printf("Isosceles\n");
        } else {
            printf("Scalene\n");
        }
    }
    return 0;