class Solution {
public String solution(String s) {
StringBuilder sb = new StringBuilder();
int index = 0;
for (char c : s.toCharArray()) {
if (c == ' ') {
sb.append(c);
index = 0;
} else {
sb.append(index % 2 == 0 ? Character.toUpperCase(c) : Character.toLowerCase(c));
index++;
}
}
return sb.toString();
}
}