import java.util.Arrays;
import java.util.stream.Collectors;

public class Pangrams {
    private static final int alphaLength = 26;

    public static boolean isPangram(String input){
        return Arrays.stream(input.replaceAll("[^a-zA-Z]","").toLowerCase().split(""))
                .collect(Collectors.toSet())
                .size() == alphaLength;
    }
}