mod=998244353 from collections import deque,defaultdict H,W,K=map(int,input().split()) L=[input() for _ in range(H)] flag=[[1]*W for _ in range(H)] D=defaultdict(set)#key=(h,w,d) D[(0,0)]={0} D2=defaultdict(int) D2[(0,0,0)]=1 ans=0 q=deque([(0,0)]) while q: h,w=q.popleft() for dh,dw in [(1,0),(0,1)]: if h+dh<H and w+dw<W and L[h+dh][w+dw]!="#": if flag[h+dh][w+dw]: q.append((h+dh,w+dw)) flag[h+dh][w+dw]=0 dd=0 if L[h+dh][w+dw]=="o":dd=1 for d in D[(h,w)]: if d+dd<K: D[(h+dh,w+dw)].add(d+dd) D2[((h+dh,w+dw,d+dd))]+=D2[(h,w,d)] D2[((h+dh,w+dw,d+dd))]%=mod ans=0 for d in D[(H-1,W-1)]: ans+=D2[(H-1,W-1,d)] ans%=mod print(ans)