import java.io.*;
import java.util.*;
import java.math.*;
 
class p253a {
    public static void main(String[] args)throws IOException {
    	Scanner sc = new Scanner(new File("input.txt"));
    	int n = sc.nextInt();
    	int m = sc.nextInt();
    	StringBuilder sb = new StringBuilder();
		while (n > 0 && m > 0) {
			if (n > m) {
				sb.append("BG");
			} else {
				sb.append("GB");
			}
			--n;
			--m;
		}
		while (n-- > 0) sb.append("B");
		while (m-- > 0) sb.append("G");
		PrintWriter pw = new PrintWriter("output.txt");
        pw.println(sb);
        pw.flush();
        pw.close();
    }
}

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