Answer:
import java.util.Scanner;
public class NestedLoops {
public static void main (String [] args) {
Scanner scnr = new Scanner(System.in);
int numRows;
int numColumns;
int currentRow;
int currentColumn;
char currentColumnLetter;
numRows = scnr.nextInt();
numColumns = scnr.nextInt();
for (currentRow = 0; currentRow < numRows; currentRow++) {
currentColumnLetter = 'A';
for (currentColumn = 0; currentColumn < numColumns; currentColumn++) {
System.out.print(currentRow + 1);
System.out.print(currentColumnLetter + " ");
currentColumnLetter++;
}
}
System.out.println("");
}
}