#include <stdio.h>#define MAXM    10int m, n;int workarr[MAXM];int record[MAXM];void DFS(int l){    int i;    if (l == n)    {        for (i=0; i<n; i++)            printf("%c", 'a'+record[i]);        printf("\n");        return;     }    for (i=0; i<m; i++)        if (workarr[i] > 0)        {            workarr[i]--;            record[l] = i;            DFS(l+1);            workarr[i]++;          }}int main(){    int i;    while (scanf("%d%d", &m, &n) != EOF)    {        for (i=0; i<m; i++)            workarr[i] = n;        DFS(0);     }    return 0;} 

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