#include <stdio.h>

int main() {
    int A, B, C;
    scanf("%d %d %d", &A, &B, &C);


    if (A <= 0 || B <= 0 || C <= 0) {
        printf("Not a triangle\n");
    }
    
    else if (A + B > C && B + C > A && A + C > B) {
        if (A == B && B == C) {
            printf("Equilateral\n"); 
        }
        else if (A == B || A == C || B == C) {
            printf("Isosceles\n");   
        }
        else {
            printf("Scalene\n");      
        }
    }
    else {
        printf("Not a triangle\n");      
    }

    return 0;
}