*p,a[];main(x,N,d,i){for(;gets(a);x=puts(a))for(*a=d=N=atoi();--d+N;)for(p=a-d;d<1?*p=!printf(d?*p?" %d":" _":"%d: 1",*p):++p<a+N;i<~d?*p=++x:0)for(i=d;!p[i--];);}