import java.io.*;
import java.math.BigInteger;
import java.util.*;

class Puzzle extends MyUtil{
	public String str;
	public int zero;
	public int[] arr;
	
	Puzzle(String str){
		this.str = str;
		arr = parseInt(str.split(" "));
		for(int i = 0; i < 8; i++){
			if(arr[i] == 0) zero = i;
		}
	}
	
	Puzzle(int[] arr){
		this.arr = arr;
		str = "" + arr[0];
		if(arr[0] == 0) zero = 0;
		for(int i = 1; i < 8; i++){
			str += " " + arr[i];
			if(arr[i] == 0) zero = i;
		}
	}
	
	public void p(){
		p(str);
		p("zero: " + zero);
	}
	
	public Puzzle swap(int swap_count){
		int[] nextArr = cp(arr);
		nextArr[zero] = nextArr[zero + swap_count];
		nextArr[zero + swap_count] = 0;
		Puzzle p = new Puzzle(nextArr);
		return p;
	}
	
	public Puzzle right(){
		if(zero == 3 || zero == 7) return null;
		return swap(1);
	}
	
	public Puzzle left(){
		if(zero == 0 || zero == 4) return null;
		return swap(-1);
	}
	
	public Puzzle ud(){
		if(zero <= 3) return swap(4);
		return swap(-4);
	}
}

/**
 * @author yoshikyoto
 */
class Main extends MyUtil{
	public static ArrayList<ArrayList<Integer>> g;
	
	public static HMSI map = new HMSI();
	
	public static void main(String args[]) throws Exception{
		// 最初にBFSでmapを作っておく
		QS q = new QS();
		String g = "0 1 2 3 4 5 6 7";
		map.add(g, 0);
		q.add(g);
		
		while(q.size() > 0){
			String str = q.pop();
			int count = map.get(str);
			Puzzle curr = new Puzzle(str);
	
			Puzzle next = curr.right();
			if(next != null && !map.containsKey(next.str)){
				q.add(next.str);
				map.add(next.str, count + 1);
			}
			
			next = curr.left();
			if(next != null && !map.containsKey(next.str)){
				q.add(next.str);
				map.add(next.str, count + 1);
			}
			
			next = curr.ud();
			if(!map.containsKey(next.str)){
				q.add(next.str);
				map.add(next.str, count + 1);
			}
		}
		
		String line;
		while((line = readLine()) != null){
			p(map.get(line));
		}
	}
}

/**
 * 整数を数え上げたりするクラス
 * new Prime(int n) でnまでエラトステネスの篩を実行。
 * @author yoshikyoto
 * @param a[i] iが素数の時true
 * @param count[i] i以下の素数の数
 */
class Prime{
	boolean[] a;
	int[] count;
	Prime(int n){
		a = new boolean[n+1];
		a[0] = false; a[1] = false;
		for(int i = 2; i <= n; i++) a[i] = true;
		// ふるい
		for(int i = 2; i < (n - 3) / 2; i++)
			if(a[i]) for(int j = 2; j * i <= n; j++)
					a[j * i] = false;
		
		// 数え上げ
		count = new int[n+1];
		count[0] = 0;
		for(int i = 1; i <= n; i++){
			int gain = 0;
			if(a[i]) gain = 1;
			count[i] = count[i-1] + gain;
		}
	}
}

class AI extends ArrayList<Integer>{}
class SI extends Stack<Integer>{}

class HMI<E> extends HashMap<E, Integer>{
	ArrayList<E> keyArray = new ArrayList<E>();
	public void add(E key){add(key, 1);}
	public void add(E key, Integer value){
		if(containsKey(key)){value += get(key);
		}else{keyArray.add(key);}
		put(key, value);
	}
}

class HMSI extends HMI<String>{}
class Q<E> extends ArrayDeque<E>{
	public void push(E item){add(item);}
	public E pop(){return poll();}
}
class QS extends Q<String>{}
class QI extends Q<Integer>{}

class MyUtil extends MyIO{
	public static long start_time = 0;
	public static void start(){start_time = System.currentTimeMillis();}
	public static void end(){
		if(start_time == 0) return;
		long time = System.currentTimeMillis() - start_time;
		if(DEBUG) p(time + "ms");
	}
	public static int digit(int n){return String.valueOf(n).length();}
	public static String reverse(String s){
		StringBuffer sb = new StringBuffer(s);
		return sb.reverse().toString();
	}
	public static void sort(int[] a){Arrays.sort(a);}
	public static void dsort(int[] a){
		Arrays.sort(a);
		int l = a.length;
		for(int i = 0; i < l/2; i++){
			int tmp = a[i]; a[i] = a[l-1-i]; a[l-1-i] = tmp;
		}
	}
	public static void sleep(int t){try{Thread.sleep(t);}catch(Exception e){}}
	public static int sum(int[] a){int s = 0; for(int i = 0; i < a.length; i++)s+=a[i]; return s;}
	public static int[] cp(int[] a){
		int[] b = new int[a.length];
		for(int i = 0; i < a.length; i++) b[i] = a[i];
		return b;
	}
}

class MyIO extends MyMath{
	static Scanner sc = new Scanner(new InputStreamReader(System.in));
	static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
	public static boolean DEBUG = false;
	public static int[] readIntMap() throws IOException{return parseInt(readLine().split(" "));}
	public static String readLine() throws IOException{return br.readLine();}
	public static int readInt() throws IOException{return Integer.parseInt(br.readLine());}
	public static void p(Object o){System.out.println(o.toString());}
	public static void pr(Object o){System.out.print(o.toString());}
	public static void d(Object o){if(DEBUG)System.out.println(o.toString());}
	public static void dr(Object o){if(DEBUG)System.out.print(o.toString());}
	public static void da(Object[] o){if(DEBUG)System.out.println(Arrays.toString(o));}
	public static void da(int[] arr){if(DEBUG)System.out.println(Arrays.toString(arr));}
	public static void da(double[] arr){if(DEBUG)System.out.println(Arrays.toString(arr));}
	public static void da(boolean[] arr){if(DEBUG)System.out.println(Arrays.toString(arr));}
	public static int[] parseInt(String[] arr){
		int[] res = new int[arr.length];
		for(int i = 0; i < arr.length; i++)res[i] = Integer.parseInt(arr[i]);
		return res;
	}
	public static double[] parseDouble(String[] arr){
		double[] res = new double[arr.length];
		for(int i = 0; i < arr.length; i++)res[i] = Double.parseDouble(arr[i]);
		return res;
	}
	public static boolean[] parseBool(String[] arr){
		int[] t = parseInt(arr);
		boolean[] res = new boolean[t.length];
		for(int i = 0; i < t.length; i++){
			if(t[i] == 1){res[i] = true;
			}else{res[i] = false;}
		}
		return res;
	}
	public static int parseInt(Object o){return Integer.parseInt(o.toString());}
}

class MyMath{
	/**
	 * 弧度法の角度を入力してsinの値を返す（Math.sin の入力はラジアン）
	 */
	public static double sin(int r){return Math.sin(Math.toRadians(r));}

	/**
	 * 弧度法の角度を入力してcosの値を返す（Math.sin の入力はラジアン）
	 */
	public static double cos(int r){return Math.cos(Math.toRadians(r));}
	public static int max(int a, int b){return Math.max(a, b);}
	public static int min(int a, int b){return Math.min(a, b);}
	public static boolean isCross(int x1, int y1, int x2, int y2, int x3, int y3, int x4, int y4){
	    // 並行な場合
	    int m = (x2-x1)*(y4-y3)-(y2-y1)*(x4-x3);
	    if(m == 0) return false;
	    // 媒介変数の値が0より大きく1以下なら交差する、これは問題の状況によって変わるかも。
	    double r =(double)((y4-y3)*(x3-x1)-(x4-x3)*(y3-y1))/m;
	    double s =(double)((y2-y1)*(x3-x1)-(x2-x1)*(y3-y1))/m;
	    return (0 < r && r <= 1 && 0 < s && s <= 1);
	}
	public static boolean isParallel(int x1, int y1, int x2, int y2, int x3, int y3, int x4, int y4){
	    if((x2-x1)*(y4-y3) == (y2-y1)*(x4-x3)) return true;
	    else return false;
	}
	public static double sq(double d){return d*d;}
	public static int sq(int i){return i*i;}
	public static int sqdist(int x1, int y1, int x2, int y2){
		return sq(x1-x2) + sq(y1-y2);}
	public static double sqdist(double x1, double y1, double x2, double y2){
		return sq(x1-x2) + sq(y1-y2);}
	public static double dist(int x1, int y1, int x2, int y2){
		return Math.sqrt(sqdist(x1, y1, x2, y2));}
	public static double dist(double x1, double y1, double x2, double y2){
		return Math.sqrt(sqdist(x1, y1, x2, y2));}
}

Measured memory_bytes: 66792