#include <stdio.h>
#include <string.h>

#define MAXCHRS 5
#define MAXTEXT 200

void inline clearbuffer()
{
    while (getchar() != '\n');
    return;
}

char doreplace(char chr, char *search, char *replace)
{
    char *search_tmp;
    if(search_tmp=strchr(search,chr))
    {
        return *(search_tmp-search+replace);
    }

    return chr;
}

int getline(char *query, char *str, int num)
{
    char chr, *str_bak = str;
    printf("%s (%d ZEICHEN)\n", query,num);
    printf("S: ");
    while (666)
    {
        memset(str,0,num-1);
        while (( chr=getchar() )!='\n')
        {
            if (str>=str_bak+num)
            {
                printf("*** MAXIMAL %d ZEICHEN ERLAUBT ***\nS: ", num);
                str=str_bak;
                clearbuffer();
                break;
            }
            *str=chr;
            str++;
        }

        if (!(str==str_bak))
        {
            str=str_bak;
            return strlen(str);
        }
    }
}


int main()
{

    char search[MAXCHRS+1], repl[MAXCHRS+1], text[MAXTEXT+1], *tmp;
    getline("SUCHEN",search, MAXCHRS);
    do
    {
        getline("ERSETZEN",repl, MAXCHRS);
    }
    while( strlen(search)!=strlen(repl) );
    getline("TEXT",text,MAXTEXT);
    tmp=text;
    printf("   ");
    while(*tmp)
    {
        putchar(doreplace(*tmp,search,repl));
        tmp++;
    }
    putchar('\n');
    return 0;
}