/*
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 */
package homework.pkg4;
 
/**
 *
 * @author Shovanjit Khatua
 */
public class Homework4 {
 
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        String myString= "adkmcbfza";
        int index = 0;
        while (myString.charAt(index) <= myString.charAt(index + 1)) {
            index++;
        }
 
       if(index==myString.length()) index=-1;
System.out.println(index);
        }
 
    }
 

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