import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.NoSuchElementException;

public class Main {

	public static void main(String[] args) {
		FastScanner sc = new FastScanner();
		PrintWriter out = new PrintWriter(System.out);

		int h = sc.nextInt();
		int w = sc.nextInt();

		int[] count = new int[26];
		for (int i = 0; i < h; i++) {
			char[] cs = sc.next().toCharArray();
			for (int j = 0; j < w; j++) {
				count[cs[j] - 'a']++;
			}
		}

		int r1 = 0, r2 = 0;

		for (int i = 0; i < count.length; i++) {
			if (count[i] % 2 == 1) r1++;
			if (count[i] % 4 == 2 || count[i] % 4 == 3) r2++;
		}
		if ((h * w) % 2 == 1) {
			if (r1 == 1 && r2 <= h / 2 + w / 2) {
				out.println("Yes");
			} else {
				out.println("No");
			}
		} else if (h % 2 + w % 2 == 0) {
			if (r1 == 0 && r2 == 0) {
				out.println("Yes");
			} else {
				out.println("No");
			}
		} else if (h % 2 == 1) {
			if (r1 == 0 && r2 <= w / 2) {
				out.println("Yes");
			} else {
				out.println("No");
			}
		} else if (w % 2 == 1) {
			if (r1 == 0 && r2 <= h / 2) {
				out.println("Yes");
			} else {
				out.println("No");
			}
		}

		out.flush();
	}

}

class FastScanner {
	private final InputStream in = System.in;
	private final byte[] buffer = new byte[1024];
	private int ptr = 0;
	private int buflen = 0;

	private boolean hasNextByte() {
		if (ptr < buflen) return true;
		else {
			ptr = 0;
			try {
				buflen = in.read(buffer);
			} catch (IOException e) {
				e.printStackTrace();
			}
			if (buflen <= 0) return false;
		}
		return true;
	}

	private byte readByte() {
		if (hasNextByte()) return buffer[ptr++];
		return -1;
	}

	private boolean isPrintableChar(byte c) {
		return '!' <= c && c <= '~';
	}

	private void skipUnprintable() {
		while (hasNextByte() && !isPrintableChar(buffer[ptr])) {
			ptr++;
		}
	}

	public boolean hasNext() {
		skipUnprintable();
		return hasNextByte();
	}

	public String next() {
		if (!hasNext()) throw new NoSuchElementException();
		StringBuilder sb = new StringBuilder();
		byte b = readByte();
		while (isPrintableChar(b)) {
			sb.appendCodePoint(b);
			b = readByte();
		}
		return sb.toString();
	}

	public int nextInt() {
		if (!hasNext()) throw new NoSuchElementException();
		int n = 0;
		boolean minus = false;
		byte b = readByte();
		if (b == '-') {
			minus = true;
			b = readByte();
		}
		if (b < '0' || '9' < b) throw new NumberFormatException();
		while (true) {
			if ('0' <= b && b <= '9') {
				n *= 10;
				n += b - '0';
			} else if (b == -1 || !isPrintableChar(b)) {
				return minus ? -n : n;
			} else {
				throw new NumberFormatException();
			}
			b = readByte();
		}
	}

	public int[] nextIntArray(int n) {
		int[] a = new int[n];
		for (int i = 0; i < n; i++) {
			a[i] = nextInt();
		}
		return a;
	}

	public long nextLong() {
		if (!hasNext()) throw new NoSuchElementException();
		long n = 0;
		boolean minus = false;
		byte b = readByte();
		if (b == '-') {
			minus = true;
			b = readByte();
		}
		if (b < '0' || '9' < b) throw new NumberFormatException();
		while (true) {
			if ('0' <= b && b <= '9') {
				n *= 10;
				n += b - '0';
			} else if (b == -1 || !isPrintableChar(b)) {
				return minus ? -n : n;
			} else {
				throw new NumberFormatException();
			}
			b = readByte();
		}
	}

	public long[] nextLongArray(int n) {
		long[] a = new long[n];
		for (int i = 0; i < n; i++) {
			a[i] = nextInt();
		}
		return a;
	}
}

Measured memory_bytes: 23124