在$st[0]$（字符串的第一个字符）处直接输出 我在这儿卡了好一会儿(90)

数据8:

P1098_8.in

3 1 1
-z-l-k-d-h-f-q-w-y-e-r-o-i-q-u-y-e-s-a-k-j-d->h-f-l-a-k-s-d-h-f-i-q-u-i-y-r-q-l-w-e-h-k-z-x->h-d-f-l-k

P1098_8.out

-z-l-k-d***h-f**********q*****w*y-e************r-o-i*******q***u***y-e*************s-a*********k-j-d***h-f*****l-a*********k*******s-d***h-f**i*******q***u-i***************y-r-q-l**********w-e**h**k**************z-x-h-d*f*****l-k