Java: if / else not responding even with no compile errors

I wrote a simple if / else that is supposed to print the answer to the if else. but does not respond even with the correct input. I can't see what I'm missing.

import java.util.Scanner;
public class MarriageQuiz{
    public static void main(String[] args){   
        Scanner input = new Scanner(System.in);
        String marStat;
        System.out.print("Please enter your Marital Status (M or S) >> ");
        marStat = input.nextLine();
        marStat = marStat.toUppercase();            
        if(marStat.equals('M')){
            System.out.print("You are married");
        }
        else if(marStat.equals('S')){
            System.out.print("You are single");
        }
    }         
}