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class Solution {
  public String solution(String str) {

        String answer=""; 
        int cnt=0; 
        String[] array=str.split(""); 

        for(int i=0; i<array.length; i++){

            if(array[i].equals(" ")){
                cnt=0; 
                answer+=" "; 
            }else{
                cnt++; 
                if(cnt % 2==0){
                    answer+=array[i].toLowerCase();
                }else{
                    answer+=array[i].toUpperCase(); 
                }
            }
        }

        return answer; 
    }
}