Submission #1515727

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Source Code Expand

 
import java.io.BufferedReader;
import java.io.InputStreamReader;
 
public class Main {
 
	public static void main(String[] args) throws Exception {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		String x = br.readLine();
		if (x.equals("a")) {
			x="-1";
		} else if (x.length() == 1) {
			x="a";
		} else {
			x = x.substring(0, x.length() - 1);
		}
		System.out.println(x);
	}
}

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