x, y = list(map(int, input().split()))
arr = []
arr.append("." * (y + 2))
for i in range(x):
    arr.append("." + str(input()) + ".")
arr.append("." * (y + 2))
nul = []
zmei_name = []
zmei_num = []
tmp_arr = [0, 0, 0, 0]
for i in range(1, x + 1):
    for j in range(1, y + 1):
        ref = arr[i][j]
        if ref in nul or ref == ".":
            continue
        else:
            tmp_arr[0] = arr[i + 1][j]
            tmp_arr[1] = arr[i][j + 1]
            tmp_arr[2] = arr[i - 1][j]
            tmp_arr[3] = arr[i][j - 1]
            tmp = 0
            for k in range(4):
                if tmp_arr[k] != ref and tmp_arr[k] != ".":
                    nul.append(ref)
                    nul.append((tmp_arr[k]))
                if tmp_arr[k] == ref:
                    tmp += 1
            if tmp >= 3:
                nul.append(ref)
                mpt = 0
                tmp = len(zmei_name)
                while mpt < tmp:
                    if zmei_name[mpt] in nul:
                        zmei_name.pop(mpt)
                        zmei_num.pop(mpt)
                        tmp -= 1
                    mpt += 1
            tmp = 0
            if ref in nul:
                continue
            else:
                for k in range(len(zmei_name)):
                    if zmei_name[k] == ref:
                        tmp = 1
                        zmei_num[k] += 1
                if not tmp and ref != ".":
                    zmei_name.append(ref)
                    zmei_num.append(1)
            for p in range(len(zmei_name)):
                if zmei_name[p] in nul:
                    zmei_name.pop(p)
                    zmei_num.pop(p)
for p in range(len(zmei_name)):
    if zmei_name[p] in nul:
        zmei_name.pop(p)
        zmei_num.pop(p)
if len(zmei_num) != 0:
    tmp = zmei_num.index(max(zmei_num))
    print("YES")
    print(zmei_name[tmp], zmei_num[tmp])
else:
    print("NO")