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import java.util.*;
 
public class Main {
 
	public static void main(String[] args) {
 
		Scanner stdin = new Scanner(System.in);
		int n = stdin.nextInt();
		ArrayList<Integer> arr = new ArrayList<Integer>();
		int[] arr2 = new int[n];
		int even = 0;
		int odd = 0;
		int lasteven = 0;
		int lastodd = 0;
 
		for (int i=1; i<=n; i++) {
			int a = stdin.nextInt();
			arr.add(a);
			arr2[i] = a;
			if (arr2[i] % 2 == 0) {
				lasteven = arr2[i];
				even++;
			} else {
				lastodd = arr2[i];
				odd++;
			}
		}
		String one = lasteven.toString();
		String two = lastodd.toString();
		int f = arr.IndexOf(one);
		int z = arr.IndexOf(two);
		Collections.sort(arr);
		if (odd > even) {
			System.out.println(f);
		} else {
			System.out.println(z);
		}
	}
}

Main.java:28: error: int cannot be dereferenced
		String one = lasteven.toString();
		                     ^
Main.java:29: error: int cannot be dereferenced
		String two = lastodd.toString();
		                    ^
Main.java:30: error: cannot find symbol
		int f = arr.IndexOf(one);
		           ^
  symbol:   method IndexOf(String)
  location: variable arr of type ArrayList<Integer>
Main.java:31: error: cannot find symbol
		int z = arr.IndexOf(two);
		           ^
  symbol:   method IndexOf(String)
  location: variable arr of type ArrayList<Integer>
4 errors

Standard output is empty