// you can also use imports, for example:
// import java.util.*;

// you can write to stdout for debugging purposes, e.g.
// System.out.println("this is a debug message");

class Solution {
    public int solution(int[] A) {
        // write your code in Java SE 8
    }
}

// you can write to stdout for debugging purposes, e.g.
// printf("this is a debug message\n");

int solution(int A[], int N) {
    // write your code in C99 (gcc 6.2.0)
}

// you can write to stdout for debugging purposes, e.g.
// printf("this is a debug message\n");

int solution(int A[], int N) {
    
    
    
}

// you can write to stdout for debugging purposes, e.g.
// printf("this is a debug message\n");

int solution(int A[], int N) {
    int i;
    
    
}

// you can write to stdout for debugging purposes, e.g.
// printf("this is a debug message\n");

int solution(int A[], int N) {
    int i, result = 0;
    
    for(i = 0; i < N; i++){
        
    }
}

// you can write to stdout for debugging purposes, e.g.
// printf("this is a debug message\n");

int solution(int A[], int N) {
    int i, result = 0;
    
    for(i = 0; i < N; i++)
        result ^= A[i];
    
    return result;
}

// you can write to stdout for debugging purposes, e.g.
// printf("this is a debug message\n");

int solution(int A[], int N) {
    int i, result = 0;
    
    for(i = 0; i < N; i++)
        result ^= A[i];
    
    return result;
}

// you can write to stdout for debugging purposes, e.g.
// printf("this is a debug message\n");

int solution(int A[], int N) {
    int i, result = 0;
    
    for(i = 0; i < N; i++)
        result ^= A[i];
    
    return result;
}