Problem:
Score : 400 points

Problem Statement

We have an H-by-W matrix.
Let a_{ij} be the element at the i-th row from the top and j-th column from the left.
In this matrix, each a_{ij} is a lowercase English letter.

Snuke is creating another H-by-W matrix, A', by freely rearranging the elements in A.
Here, he wants to satisfy the following condition:

Every row and column in A' can be read as a palindrome.

Determine whether he can create a matrix satisfying the condition.

Note

A palindrome is a string that reads the same forward and backward.
For example, a, aa, abba and abcba are all palindromes, while ab, abab and abcda are not.

Constraints

1 ≤ H, W ≤ 100

a_{ij} is a lowercase English letter.

Input

Input is given from Standard Input in the following format:

H W
a_{11}a_{12}...a_{1W}
:
a_{H1}a_{H2}...a_{HW}

Output

If Snuke can create a matrix satisfying the condition, print Yes; otherwise, print No.

Sample Input 1

3 4
aabb
aabb
aacc

Sample Output 1

Yes

For example, the following matrix satisfies the condition.

abba
acca
abba

Sample Input 2

2 2
aa
bb

Sample Output 2

No

It is not possible to create a matrix satisfying the condition, no matter how we rearrange the elements in A.

Sample Input 3

5 1
t
w
e
e
t

Sample Output 3

Yes

For example, the following matrix satisfies the condition.

t
e
w
e
t

Sample Input 4

2 5
abxba
abyba

Sample Output 4

No

Sample Input 5

1 1
z

Sample Output 5

Yes

Solution in Python (3.8.2) (judge verdict: Wrong Answer)

from collections import Counter, defaultdict
H, W = map(int, input().split())
A = [list(input()) for i in range(H)]

for i in range(H):
    c = Counter(A[i])
    ans = 0
    for j in c:
        if c[j] % 2 == 1:
            ans += 1
        if H % 2 == 1 and ans > 1:
            print("No")
            exit()
        elif H % 2 == 0 and ans > 0:
            print("No")
            exit()

for i in range(W):
    ans = 0
    d = defaultdict(int)
    for j in range(H):
        d[A[j][i]] += 1
    for l in d:
        if d[l] % 2 == 1:
            ans += 1
        if H % 2 == 1 and ans > 1:
            print("No")
            exit()
        elif H % 2 == 0 and ans > 0:
            print("No")
            exit()
print("Yes")