#include "iostream.h"

char t [ 6 ] = { 0 } ;
int sl = 3 ;
int mark = 0 ;
int last [ 1000 ] = { 0 } ;
//int result = 0 ;
char unit [ 26 ] = { 'a' , 'b' , 'c' , 'd' , 'e' , 'f' , 'g' , 
					 'h' , 'i' , 'j' , 'k' , 'l' , 'm' , 'n' , 
					 'o' , 'p' , 'q' , 'r' , 's' , 't' , 'u' , 
					 'v' , 'w' , 'x' , 'y' , 'z' } ;
int count ( char * s , int l , int n , int result = 0 ) 
{
//	if ( 2 < n )
//		return 0 ;
	if ( n > l )
		return 0 ;
	if ( n == 1 )
	{	
		if ( mark == sl - 1 )
		{	mark = 0 ;
			return ( t [ sl - 1 ] - s [ 0 ] + 1 ) ;		
		}
		else
		{	mark = 0 ;
			return l ;
		}
		
	}
	
	int i = 0 ;
	int r = 0 ;
	for ( i = 0 ; i < l - n + 1 ; i ++ )
	{
		if ( t [ sl - n ] + 1 == s [ i ] )
			 break ;	
		if ( t [ sl - n ] == s [ i ] )
			mark ++ ;
		r = count ( &s [ i + 1 ] , l - i - 1 , n - 1 ) ;
		result = result + r ;
	}
	return result ;
}


int main(int argc, char* argv[])
{
	int temp [ 5 ] = { 0 , 26 , 351 , 2951 , 14950 + 2951 } ;
	int j = 0 ;
	while ( cin >> t )
	{
		
		for ( sl = 0 ; sl < 5 ; sl ++ )
		{	
			if ( t [ sl ] == 0 ) break ;
			if ( t [ sl ] == 0 ) continue ;
			if ( t [ sl - 1 ] >= t [ sl ] || ( t [ sl ] > 'z' || t [ sl ] < 'a' ) 
				 || t [ 5 ] != 0 ) 
			{	mark = 1 ; t [ 5 ] = 0 ; break ;	}
		}
		if ( mark == 1 )
		{	last [ j ] = 0 ; j ++ ; mark = 0 ; continue ;	}
//		cout << t << endl ;
	//	cout << sl << endl ;
		last [ j ] = temp [ sl - 1 ] + count ( unit , 26 , sl ) ;
		j ++ ;
	}
	for ( sl = 0 ; sl < j  ; sl ++ )
		cout << last [ sl ] << endl ;
	return 0;
}