Problem Statement

There are N buildings aligned in a row. The i-th building from the left has a height of H_i.
Determine if there is a building taller than the first one from the left. If such a building exists, find the position of the leftmost such building from the left.

Input

The input is given from Standard Input in the following format:
N
$H_1 H_2 \ldots H_N$

Output

If no building is taller than the first one from the left, print -1.
If such a building exists, print the position (index) of the leftmost such building from the left.

Constraints

• $1 \leq N \leq 100$
• $1 \leq H_i \leq 100$
• All input values are integers.

Sample Input 1

4
3 2 5 2

Sample Output 1

3

The building taller than the first one from the left is the third one from the left.

Sample Input 2

3
4 3 2

Sample Output 2

-1

No building is taller than the first one from the left.

Sample Input 3

7
10 5 10 2 10 13 15

Sample Output 3

6

The buildings taller than the first one from the left are the sixth and seventh ones. Among them, the leftmost is the sixth one.

见题面 Input 部分

见题面 Output 部分