pourtant le résultat est bon.
package fr.codegym.task.task08.task0823;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
/*
Expansion nationale
*/
public class Solution {
public static void main(String[] args) throws IOException {
BufferedReader saisie = new BufferedReader(new InputStreamReader(System.in));
String[] tab = null;
String s = saisie.readLine();
tab = s.split(" ");
for(int i = 0; i < tab.length; i++){
tab[i] = tab[i].substring(0, 1).toUpperCase()+tab[i].substring(1);
}
System.out.print(tab[0]+" "+tab[1]+" "+tab[2]);
}
}