// 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
    }
}

import java.util.*;

class Solution {
    public int solution(int[] A) {
        System.out.println();
    }
}

import java.util.*;

class Solution {
    private Set<Long> HashSet = new HashSet<>();
    public int solution(int[] A) {
        for (int a : A) {
            
        }
        
        return 
    }
}

import java.util.*;

class Solution {
    private Set<Long> memo = new HashSet<>();
    
    public int solution(int[] A) {
        for (int a : A) {
            
        }
        
        return memo.size();
    }
}

import java.util.*;

class Solution {
    private Set<Long> set = new HashSet<>();
    
    public int solution(int[] A) {
        for (int a : A) {
            set.add(Math.abs(Long.valueOf(a));
        }
        
        return set.size();
    }
}

import java.util.*;

class Solution {
    private Set<Long> set = new HashSet<>();
    
    public int solution(int[] A) {
        for (int a : A) {
            set.add(Math.abs(Long.valueOf(a)));
        }
        
        return set.size();
    }
}

import java.util.*;

class Solution {
    private Set<Long> set = new HashSet<>();
    
    public int solution(int[] A) {
        for (int a : A) {
            set.add(Math.abs(Long.valueOf(a)));
        }
        
        return set.size();
    }
}

import java.util.*;

class Solution {
    private Set<Long> set = new HashSet<>();
    
    public int solution(int[] A) {
        for (int a : A) {
            set.add(Math.abs(Long.valueOf(a)));
        }
        
        return set.size();
    }
}