import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.ArrayDeque;
import java.util.HashMap;
import java.util.Map;
import java.util.NoSuchElementException;

public class Main {

	public static void main(String[] args) throws IOException {
		new Main().solve();
	}

	private void solve() throws IOException {
		try {
			solveA();
		} finally {
			if (in != null) {
				in.close();
			}
			if (out != null) {
				out.flush();
				out.close();
			}
		}

	}

	private String swapCharacter(String base, int s, int t) {
		char[] wk = base.toCharArray();
		char c = wk[t];
		wk[t] = wk[s];
		wk[s] = c;
		return new String(wk);
	}

	private void solveA() {
		Map<String, Long> memo = init();

		while (hasNext()) {
			StringBuilder builder = new StringBuilder();
			for (int i = 0; i < 8; i++) {
				builder.append(next());
			}
			System.out.println(memo.get(builder.toString()));
		}

	}

	private Map<String, Long> init() {
		final String DEF = "01234567";
		Map<String, Long> memo = new HashMap<String, Long>();

		ArrayDeque<String> queue = new ArrayDeque<String>();
		queue.addFirst(DEF);
		memo.merge(DEF, 0L, (oldV, newV) -> newV);

		int[] d = new int[] { 0, 1, 0, -1 };
		while (!queue.isEmpty()) {
			String tmp = queue.pollLast();

			int index = tmp.indexOf("0");

			for (int i = 0; i < d.length; i++) {
				int wkX = d[i] + index % 4;
				int wkY = d[i ^ 1] + index / 4;
				if (wkX < 0 || wkX >= 4 | wkY < 0 || wkY >= 2) {
					continue;
				}
				int target = wkX + wkY * 4;
				String newKey = swapCharacter(tmp, index, target);
				if (!memo.containsKey(newKey)) {
					long step = memo.get(tmp);
					memo.put(newKey, step + 1);
					queue.addFirst(newKey);
				}
			}

		}
		return memo;
	}

	private final PrintWriter out = new PrintWriter(System.out);
	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 static 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 int nextInt() {
		return Integer.parseInt(next());
	}

	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 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();
		}
	}
}


Measured memory_bytes: 37236