#inclde <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");
    }
    else if ( a == b && b ==c){
        printf("Equilateral");
    }
    else if( a == b || b == c || a == c){
        printf("Isoceles");
    }
    else{
        printf("scalene");
    }
    return 0;
    }