import java.util.*;
import java.io.*;
public class Main {
    static IO io = new IO();
    public static void main(String[] args) {
         
        Map<Integer, Integer> ans = new HashMap<Integer, Integer>();
        Deque<int[][]> que = new ArrayDeque<int[][]>();
        int init[] = {0,1,2,3,4,5,6,7};
        que.offer(new int[][] {init,{0},{-1},{0}});//0???????????????¶??????1??????????????????2???´?????????????????????3????????????°
        int dx[] = {-4, 1, 4, -1};
        while (!que.isEmpty()) {
            int[][] p = que.pollFirst();
            if (ans.containsKey(conv(p[0]))) continue;
            else ans.put(conv(p[0]), p[3][0]);
            for (int i=0; i<4; i++) {
                int go = p[1][0] + dx[i];
                if (go==p[2][0] || go<0 || 7<go || (p[1][0]==3 && go==4) || (p[1][0]==4 && go==3)) continue;
                int next[] = new int[8];
                next = p[0].clone();
                swap(next, p[1][0], go);
                que.offer(new int[][] {next, {go}, {p[1][0]}, {p[3][0]+1}});
            }
        }
                 
        while (io.hasNext()) {
            int q = 0;
            for (int i=0; i<=7; i++) {
                q += (io.nextInt()+1) * Math.pow(10, 7-i);
            }
            System.out.println(ans.get(q));
        }
    }
     
    static void swap(int ar[], int a, int b) {
        int tmp = ar[a];
        ar[a] = ar[b];
        ar[b] = tmp;
    }
     
    static int conv(int ar[]) {
        int ans = 0;
        for (int i=0; i<=7; i++) {
            ans += (ar[7-i]+1)*Math.pow(10, i);
        }
        return ans;
    }
 
    static class IO extends PrintWriter {
        private final InputStream in;
        private final byte[] buffer = new byte[1024];
        private int ptr = 0;
        private int buflen = 0;
 
        public IO() { this(System.in);}
        public IO(InputStream source) { super(System.out); this.in = source;}
        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 static boolean isNewLine(int c) { return c == '\n' || c == '\r';}
        private void skipUnprintable() { while(hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;}
        private void skipNewLine() { while(hasNextByte() && isNewLine(buffer[ptr])) ptr++;}
        public boolean hasNext() { skipUnprintable(); return hasNextByte();}
        public boolean hasNextLine() { skipNewLine(); 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 char[] nextCharArray(int len) {
            if (!hasNext()) {
                throw new NoSuchElementException();
            }
            char[] s = new char[len];
            int i = 0;
            int b = readByte();
            while(isPrintableChar(b)) {
                if (i == len) {
                    throw new InputMismatchException();
                }
                s[i++] = (char) b;
                b = readByte();
            }
            return s;
        }
        public String nextLine() {
            if (!hasNextLine()) {
                throw new NoSuchElementException();
            }
            StringBuilder sb = new StringBuilder();
            int b = readByte();
            while(!isNewLine(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();
            }
        }
        public int nextInt() {
            long nl = nextLong();
            if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) {
                throw new NumberFormatException();
            }
            return (int) nl;
        }
        public char nextChar() {
            if (!hasNext()) {
                throw new NoSuchElementException();
            }
            return (char) readByte();
        }
        public double nextDouble() { return Double.parseDouble(next());}
        public int[] arrayInt(int n) { int[] a = new int[n]; for(int i=0;i<n;i++) a[i] = nextInt(); return a;}
        public long[] arrayLong(int n) { long[] a = new long[n]; for(int i=0;i<n;i++) a[i] = nextLong(); return a;}
        public double[] arrayDouble(int n) { double[] a = new double[n]; for(int i=0;i<n;i++) a[i] = nextDouble(); return a;}
        public void arrayInt(int[]... a) {for(int i=0;i<a[0].length;i++) for(int j=0;j<a.length;j++) a[j][i] = nextInt();}
        public int[][] matrixInt(int n,int m) { int[][] a = new int[n][]; for(int i=0;i<n;i++) a[i] = arrayInt(m); return a;}
        public char[][] charMap(int n,int m) { char[][] a = new char[n][]; for(int i=0;i<n;i++) a[i] = nextCharArray(m); return a;}
        public void close() {
            super.close();
            try {
                in.close();
            } catch (IOException e) {}
        }
    }
}

Measured memory_bytes: 36896