import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class RunLengthEncoding {
    public String encode(String data) {
        throw new UnsupportedOperationException("Method has not been implemented yet.");
    }

    public String decode(String encodedData) {
        throw new UnsupportedOperationException("Method has not been implemented yet.");
    }
}
public class RunLengthEncoding {
    public String encode(String data) {
        throw new UnsupportedOperationException("Method has not been implemented yet.");
    }

    public String decode(String encodedData) {
        throw new UnsupportedOperationException("Method has not been implemented yet.");
    }
}

Update RunLengthEncoding.java