H,W,K = map(int,input().split())
S = [input().strip() for _ in range(H)]
MOD = 998244353
dp = [[[0 for _ in range(K+1)] for _ in range(W)] for _ in range(H)]
for k in range(1,K+1):
    dp[0][0][k] = 1
for j in range(1,W):
    for k in range(1,K+1):
        if S[0][j]==".":
            dp[0][j][k] = dp[0][j-1][k]
        elif S[0][j]=="o" and k<K:
            dp[0][j][k] = dp[0][j][k+1]
for i in range(1,H):
    for k in range(1,K+1):
        if S[i][0]==".":
            dp[i][0][k] = dp[i-1][0][k]
        elif S[i][0]=="o" and k<K:
            dp[i][0][k] = dp[i-1][0][k+1]
for i in range(1,H):
    for j in range(1,W):
        for k in range(1,K+1):
            if S[i][j]==".":
                dp[i][j][k] = (dp[i-1][j][k]+dp[i][j-1][k])%MOD
            elif S[i][j]=="o" and k<K:
                dp[i][j][k] = (dp[i-1][j][k+1]+dp[i][j-1][k+1])%MOD
print(dp[H-1][W-1][1])