public class ArrayStuff {
  public static boolean isOdd(int x) {
    return x % 2 != 0;
  }
	
  public static int indexOfFirstOdd(int []A) {
    for (int i = 0; i < A.length; i++) {
      if (isOdd(A[i])) {
        return i;
      }
    }
		
    return -1;
  }
}