import java.util.Arrays;
import java.util.stream.Collectors;
public class PangramChecker {
private static final int alphaLength = 26;
public boolean isPangram(String input) {
return Arrays.stream(input.replaceAll("[^a-zA-Z]", "")
.toLowerCase()
.split(""))
.collect(Collectors.toSet())
.size() == alphaLength;
}
}