/* package whatever; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
		String s1 = "zyxwv";
		String s2 = "edcba";
		System.out.println(solve(0,0,s1.toCharArray(),s2.toCharArray()));
	}
	
	public static int solve(int i, int j, char[] str1, char[] str2 ){
		
		if(i== str1.length && j == str2.length) return 0;
		
		int ans = Integer.MAX_VALUE;
		
		if(i<str1.length ){
			char ch = str1[i];
			int intCfts = checkConflicts(str1, i, ch);
			int newCfts = checkConflicts(str2, j, ch);
			ans = Math.min(ans, intCfts+newCfts+solve(i+1,j, str1, str2));
		}
		
		if(j<str2.length ){
			char ch = str2[j];
			int intCfts = checkConflicts(str2, j, ch);
			int newCfts = checkConflicts(str1, i, ch);
			ans = Math.min(ans, intCfts+newCfts+solve(i,j+1,str1, str2));
			
		}
		
		return ans;
		
	}
	public static int checkConflicts(char[] str, int index, char ch){
		int cnt = 0;
		for(int i = index; i< str.length; i++){
			if(str[i]-'a' < ch-'a') cnt++;
		}
		return cnt;
	}
}