Java :

import java.util.Scanner;
public class Main
{
	public static void main(String[] args)
	{
		Scanner sc=new Scanner(System.in);
		while(sc.hasNext())
		{
			String str=sc.next();
			char ch[]=str.toCharArray();
			switch(ch.length)
			{
			case 1:
				getNumbers1(ch[0]);
				break;
			case 2:
				if(ch[0]<ch[1])
					getNumbers2(ch[0],ch[1]);
				else
					System.out.println(0);
				break;
			case 3:
				if(ch[0]<ch[1]&&ch[1]<ch[2])
					getNumbers3(ch[0],ch[1],ch[2]);
				else
					System.out.println(0);
				break;
			case 4:
				if(ch[0]<ch[1]&&ch[1]<ch[2]&&ch[2]<ch[3])
					getNumbers4(ch[0],ch[1],ch[2],ch[3]);
				else
					System.out.println(0);
				break;
			case 5:
				if(ch[0]<ch[1]&&ch[1]<ch[2]&&ch[2]<ch[3]&&ch[3]<ch[4])
					getNumbers5(ch[0],ch[1],ch[2],ch[3],ch[4]);
				else
					System.out.println(0);
				break;
			}
		}
	}
	public static void getNumbers1(char x)
	{
		int sum=0;
		for(char a='a';a<=x;a++)
			sum++;
		System.out.println(sum);
	}
	public static void getNumbers2(char x,char y)
	{
		int sum=26;
		for(char a='a';a<=x-1;a++)
			for(char b=(char)(a+1);b<='z';b++)
				sum++;
		for(char b=(char)(x+1);b<=y;b++)
			sum++;
		System.out.println(sum);
	}
	public static void getNumbers3(char x,char y,char z)
	{
		int sum=351;
		for(char a='a';a<=x-1;a++)
			for(char b=(char)(a+1);b<='y';b++)
				for(char c=(char)(b+1);c<='z';c++)
					sum++;
		for(char b=(char)(x+1);b<=y-1;b++)
			for(char c=(char)(b+1);c<='z';c++)
				sum++;
		for(char c=(char)(y+1);c<=z;c++)
			sum++;
		System.out.println(sum);
	}
	public static void getNumbers4(char x,char y,char z,char m)
	{
		int sum=2951;
		for(char a='a';a<=x-1;a++)
			for(char b=(char)(a+1);b<='x';b++)
				for(char c=(char)(b+1);c<='y';c++)
					for(char d=(char)(c+1);d<='z';d++)
						sum++;
		for(char b=(char)(x+1);b<=y-1;b++)
			for(char c=(char)(b+1);c<='y';c++)
				for(char d=(char)(c+1);d<='z';d++)
					sum++;
		for(char c=(char)(y+1);c<=z-1;c++)
			for(char d=(char)(c+1);d<='z';d++)
				sum++;
		for(char d=(char)(z+1);d<=m;d++)
			sum++;
		System.out.println(sum);
	}
	public static void getNumbers5(char x,char y,char z,char m,char n)
	{
		int sum=17901;
		for(char a='a';a<=x-1;a++)
			for(char b=(char)(a+1);b<='w';b++)
				for(char c=(char)(b+1);c<='x';c++)
					for(char d=(char)(c+1);d<='y';d++)
						for(char e=(char)(d+1);e<='z';e++)
							sum++;
		for(char b=(char)(x+1);b<=y-1;b++)
			for(char c=(char)(b+1);c<='x';c++)
				for(char d=(char)(c+1);d<='y';d++)
					for(char e=(char)(d+1);e<='z';e++)
						sum++;
		for(char c=(char)(y+1);c<=z-1;c++)
			for(char d=(char)(c+1);d<='y';d++)
				for(char e=(char)(d+1);e<='z';e++)
					sum++;
		for(char d=(char)(z+1);d<=m-1;d++)
			for(char e=(char)(d+1);e<='z';e++)
				sum++;
		for(char e=(char)(m+1);e<=n;e++)
			sum++;
		System.out.println(sum);
	}
}