#include <bits/stdc++.h>   using namespace std;   template <typename T>   void read(T &x) {     T f = 1;     x = 0;     char s = getchar();     while (s <  0  || s >  9 ) {       if (s ==  - ) f = -1;       s = getchar();     }     while (s >=  0  && s <=  9 ) {       x = x * 10 + s -  0 ;       s = getchar();     }     x *= f;   }   template <typename T>   void prll(T x) {     if (x < 0) putchar( - ), x = -x;     if (x > 9) prll(x / 10);     putchar(x % 10 +  0 );   }   struct Change {     int x, y, Ans;   } q[2005];   char s[2005][2005];   int up[2005][2005], down[2005][2005];   int dp[2005][2005];   int n, m, Q;   struct Deque {     int s, t, deq[2005];     Deque() { s = 1, t = 0; }     bool empty() { return s > t; }     void push_back(int x) { deq[++t] = x; }     void pop_back() { t--; }     void pop_front() { s++; }     void clear() { s = 1, t = 0; }     int front() { return deq[s]; }     int back() { return deq[t]; }   } q1, q2;   bool check(const int x, const int len) {     q1.clear();     q2.clear();     for (int i = 1; i < len; i++) {       while (!q1.empty() && up[x][q1.back()] >= up[x][i]) q1.pop_back();       q1.push_back(i);       while (!q2.empty() && down[x][q2.back()] >= down[x][i]) q2.pop_back();       q2.push_back(i);     }     for (int i = len; i <= m; i++) {       while (!q1.empty() && q1.front() <= i - len) q1.pop_front();       while (!q2.empty() && q2.front() <= i - len) q2.pop_front();       while (!q1.empty() && up[x][q1.back()] >= up[x][i]) q1.pop_back();       q1.push_back(i);       while (!q2.empty() && down[x][q2.back()] >= down[x][i]) q2.pop_back();       q2.push_back(i);       if (up[x][q1.front()] + down[x][q2.front()] - 1 >= len) return true;     }     return false;   }   int main() {     read(n);     read(m);     read(Q);     for (int i = 1; i <= n; i++) scanf( %s , s[i] + 1);     for (int i = 1; i <= Q; i++) {       read(q[i].x);       read(q[i].y);       s[q[i].x][q[i].y] =  X ;       q[i].Ans = 0;     }     for (int i = 1; i <= n; i++) {       for (int j = 1; j <= m; j++) {         if (s[i][j] !=  . ) s[i][j] = 0;         if (s[i][j]) up[i][j] = up[i - 1][j] + 1;       }     }     for (int i = n; i >= 1; i--) {       for (int j = 1; j <= m; j++)         if (s[i][j]) down[i][j] = down[i + 1][j] + 1;     }     int res = 0;     for (int i = 1; i <= n; i++)       if (s[i][1]) dp[i][1] = 1, res = max(res, dp[i][1]);     for (int i = 1; i <= m; i++)       if (s[1][i]) dp[1][i] = 1, res = max(res, dp[i][1]);     for (int i = 2; i <= n; i++) {       for (int j = 2; j <= m; j++)         if (s[i][j])           dp[i][j] = min(dp[i - 1][j], min(dp[i][j - 1], dp[i - 1][j - 1])) + 1,           res = max(res, dp[i][j]);     }     for (int i = Q; i >= 1; i--) {       q[i].Ans = res;       if (i == 1) break;       int x = q[i].x, y = q[i].y;       s[x][y] = 1;       for (int i = 1; i <= n; i++)         if (s[i][y]) up[i][y] = up[i - 1][y] + 1;       for (int i = n; i >= 1; i--)         if (s[i][y]) down[i][y] = down[i + 1][y] + 1;       int l = 0, r = m, mid, ans;       while (l <= r) {         mid = (l + r) >> 1;         if (check(x, mid))           l = mid + 1, ans = mid;         else           r = mid - 1;       }       res = max(ans, res);     }     for (int i = 1; i <= Q; i++) printf( %d n , q[i].Ans);     return 0;   }