using System;
 
public class Test
{
	public static void Main()
	{
		// your code goes here
	}
}
 

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using System;

public class Test
{
	public static void Main()
	{
	int x ;
            Console.Write(" Enter your degree : ");
            int.TryParse(Console.ReadLine() , out x)
          
            if( x >= 90 && x <= 100 )
            {
                Console.WriteLine(" Grade is A ");
                
            }
            else if (x < 90 && x >= 70 ) 
            {
                Console.WriteLine(" Grade is B ");
            }
            else if ( x < 70 && x >= 60 ) 
            {
                Console.WriteLine(" Grade is C ");
            }
            else if ( x < 60 && x>= 50 ) 
            {
                Console.WriteLine(" Grade is D ");
            }
            else
            {
            Console.WriteLine(" Grade is F ");
            }
	}
}