import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayDeque;
import java.util.Arrays;
import java.util.NoSuchElementException;

public class Main {
	public static void main(String[] args) {
		// long t = System.currentTimeMillis();
		new Main().run();
		// System.err.println(System.currentTimeMillis() - t);
	}

	void run() {
		Scanner sc = new Scanner();
		String s = sc.next();
		int n = s.length();
		int[] cnt = new int[n];
		for (int i = 0; i < n; ++i) {
			int c = (int) (s.charAt(i) - 'a');
			cnt[i] = (i > 0 ? cnt[i - 1] : 0) ^ (1 << c);
		}

		ArrayDeque<int[]> que = new ArrayDeque<>();
		for (int i = 0; i < n; ++i) {
			int l = que.size();
			int min = Integer.MAX_VALUE;
			for (int t = 0; t < l; ++t) {
				int[] state = que.pollLast();
				int v = cnt[state[0]] ^ cnt[i];
				if (Integer.bitCount(v) <= 1) {
					min = Math.min(min, state[1] + 1);
				}
				que.addFirst(state);
			}
			if (min < Integer.MAX_VALUE)
				que.addFirst(new int[] { i, min });
			if (Integer.bitCount(cnt[i]) <= 1) {
				que.addFirst(new int[] { i, 1 });
			}
		}

		int ans = s.length();
		while (!que.isEmpty()) {
			int[] state = que.pollLast();
			if (state[0] == n - 1) {
				ans = Math.min(ans, state[1]);
			}
		}
		System.out.println(ans);
	}

	static void tr(Object... objects) {
		System.out.println(Arrays.deepToString(objects));
	}

	class Scanner {
		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 int readByte() {
			if (hasNextByte())
				return buffer[ptr++];
			else
				return -1;
		}

		private boolean isPrintableChar(int c) {
			return 33 <= c && c <= 126;
		}

		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();
			int 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;
			int 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 nextLong() {
			if (!hasNext())
				throw new NoSuchElementException();
			long n = 0;
			boolean minus = false;
			int 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();
			}
		}
	}
}
