#include <iostream>
#include <cstdlib>
#include <cstdio>
#include <string>
using namespace std;

int n, m;
string a[1010];
bool ans = 0;
char c;

bool check(int x, int y)
{
    if (x < 0 || x >= n || y < 0 || y >= m)
        return false;
    return a[x][y] == c;
}

bool solve(int x, int y)
{
    c = a[x][y];
    bool g;

    g = 1;
    for (int i = 0; i < 5; i++)
        g &= check(x, y + i);
    if (g)
        return true;

    g = 1;
    for (int i = 0; i < 5; i++)
        g &= check(x + i, y);
    if (g)
        return true;

    g = 1;
    for (int i = 0; i < 5; i++)
        g &= check(x + i, y + i);
    if (g)
        return true;

    g = 1;
    for (int i = 0; i < 5; i++)
        g &= check(x + i, y - i);
    if (g)
        return true;

    return false;
}

int main()
{
    freopen("tic-tac-toe.in", "r", stdin);
    freopen("tic-tac-toe.out", "w", stdout);

    cin >> n >> m;
    for (int i = 0; i < n; i++)
        cin >> a[i];
    for (int x = 0; x < n; x++)
        for (int y = 0; y < m; y++)
        {
            if (a[x][y] == '.')
                continue;
            ans |= solve(x, y);
        }
    if (ans)
        printf("Yes\n");
    else
        printf("No\n");

    return 0;
}