i don't understand why its not working
package fr.codegym.task.task07.task0721;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
/*
Minimum et maximum dans les tableaux
*/
public class Solution {
public static void main(String[] args) throws IOException {
BufferedReader lecteur = new BufferedReader(new InputStreamReader(System.in));
int[] a = new int[20];
int maximum = 0;
int minimum = 0;
for(int i = 0;i<20;i++){
a[i] = Integer.parseInt(lecteur.readLine());
}
//écris ton code ici
for(int i = 0;i<20;i++){
if(minimum>a[i])
minimum = a[i];
}
for(int i = 0;i<20;i++){
if(maximum<a[i]){
maximum = a[i];
}
}
//écris ton code ici
System.out.print(maximum + " " + minimum);
}
}