include<stdio.h>
int mani(){
int a,b,c;
scanf("%d %d %d",&a,&b,&c);
if(a <= || b <= 0 || c <=0){
printf("invalid iput");
}

else if(a == b && b == c ){
printf("equilateral");

}
else if(a == b || b == c || a == c){
    printf("isoceles");
    
}
    else{
        printf("scalene");
    }
    return 0;
}