//Sample08_035.java
class Sample08_035{

    static final char CH_START = 'a';
    static final char CH_END = 'z';

    static String method_for(char ch){

        if(CH_START > ch || ch > CH_END){
             return null;
        }

        String str ="";

				int i = 0;
				for(; i<26; i++){
				    str += (char)ch++;
				    if(ch > CH_END)break;
				}
				i++;
				System.out.println("count: " + i);
				return str;
  }

  public static void main(String[] args){
        String str = method_for('v');
        System.out.println(str);
  }
}