Find the first occurrence of a given number.

Difficulty: Easy

Phase: 4 · Basic Arrays

XP Reward: 10 XP

Topics: Basic Arrays, Easy

Supported Languages: Python, JavaScript, C, C++, Java

Problem Description

Given N followed by N integers on line 2, and target X on line 3, find the 0-based index of the first occurrence of X (or -1 if not found). Input Format: Read input from standard input (stdin). Output Format: Print the result to standard output (stdout).

Constraints

-10^9 <= N <= 10^9

Examples

Example 1

Input: 5 10 20 30 20 50 20

Output: 1

Explanation: Sample execution for input 5 10 20 30 20 50 20