#include<stdio.h>


void expand( const char *s1, char *s2 )
{
    int i, j, k;

    i = j = k = 0;

    while( s1[i] != '\0' )
    {
        if( s1[i]=='-' && i>0 && s1[i+1]!='\0' )
        {
            if( s1[i-1] < s1[i+1] )
            {
                for( k=s1[i-1]+1; k<=s1[i+1]; k++ )
                {
                    s2[j++] = k;
                }
            }
            else
            {
                for( k=s1[i-1]-1; k>=s1[i+1]; k-- )
                {
                    s2[j++] = k;
                }
            }

            i++;
        }
        else
        {
            s2[j++] = s1[i];
        }

        i++;
    }

    s2[j]='\0';
}


int main()
{
    const char s1[] = "a-z";
    char s2[100];
    
    expand( s1, s2 );
    printf("%s\n", s2);



    return 0;
}