import sys

def get_array(): return list(map(int, sys.stdin.readline().split()))
def get_ints(): return map(int, sys.stdin.readline().split())
def input(): return sys.stdin.readline().strip('\n')


visited = []
out = []

for i in range(1010):
    visited.append([])
    out.append([])
    for j in range(1010):
        visited[i].append(0)
        out[i].append(-1)
cells = []
def dfs(x,y):
    global c
    if x >= n or x < 0 or y >= m or y < 0:
        return
    if l[x][y] == '*':
        c += 1
        return
    if visited[x][y] :
       return
    visited[x][y] = 1
    cells.append((x,y))
    dfs(x+1,y)
    dfs(x,y+1)
    dfs(x-1,y)
    dfs(x,y-1)

n , m , k = get_ints()
l = []
for i in range(n):
    l.append(list(input()))

for i in range(n):
    for j in range(m):
        if not visited[i][j] and l[i][j] == '.':
            c = 0
            dfs(i,j)
            for x in cells:
                if visited[x[0]][x[1]] and out[x[0]][x[1]] == -1:
                    out[x[0]][x[1]] = c
            cells.clear()
for i in range(k):
    x , y = get_ints()
    x , y = x-1 , y-1
    ans = out[x][y]
    print(ans)