c;d;q[];p=q;main(a,b){for(scanf("%d,%d",&a,&b);b;!d--?memset(p,++c+96,a),d=b<a?a-=b,p+=b,0:a:puts(q,b--));}
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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