#include<stdio.h>
int main() {
    int a, b, c;
    printf("Enter the three side lengths of the triangle: ");
    scanf("%d %d %d", &n1, &n2, &n3);
    if (n1 < 0 || n2 <0 || n3 < 0) {
        printf("Invalid Input\n");  
    } else if (n1 == n2 && n2 == n3) {
        printf("Equilateral|/\n");
    } else if (n1 == n2 || n1 == n3 || n2 == n3) {
        printf("Isosceless\n");
    } else {
        printf("scalene\n");
    }
    
    return 0;
}