//go 1.6

//Grade Calculator
	

package main
import "fmt"
func main() {
	score := 0
	
	fmt.Printf("\n\tEnter your score:  ")
	fmt.Scanln(&score)
	
	fmt.Printf(sc2gr(score))	
}

func sc2gr(score int) string{
	grade := "F"
	
	if(score>0 && score<100){
		if(score>90) {
			grade = "A"
		}else if(score>80) {
			grade = "B"
		}else if(score>70) {
			grade = "C"
		}else if(score>60) {
			grade = "D"
		}
	}else {
		fmt.Printf("\n\tERROR: Invalid score\n")
	}
	
	return grade
}