#include<iostream>
#include<cstdio>
#include<cstring>
#include<vector>
#include<algorithm>
#include<cmath>
#include<queue>
#include<map>
#include<stack>
#include<set>
using namespace std;
typedef long long ll;
const int maxn=20010;
const int inf=0xfffffff;

char maze[5][5];
char ans[5][5];
char a[10],b[10],ai=1,bi=1;

bool isjie(){
	int i,j;
	int ans1=0;
	for(i=2;i<=9;++i){
		if(a[i]=='.') continue;
		int sum=0;
		for(j=1;j<i;++j){
			if(a[j]=='.') continue;
			if(a[j]>a[i]){
				sum++;
			}
		}
		ans1+=sum;
	}
	int ans2=0;
	for(i=2;i<=9;++i){
		if(b[i]=='.') continue;
		int sum=0;
		for(j=1;j<i;++j){
			if(b[j]=='.') continue;
			if(b[j]>b[i]){
				sum++;
			}
		}
		ans2+=sum;
	}
	ans1=ans1&1;
	ans2=ans2&1;
	if(ans1^ans2){
		return false;
	}
	return true;
	
}

int geth(){
	int i,j,sum=0;
    for(i=1;i<=3;++i){
        for(j=1;j<=3;++j){
            char c=ans[i][j];
            if(c=='.') continue;
            for(int k=1;k<=3;++k){
            	for(int l=1;l<=3;++l){
            		if(maze[k][l]==c){
            			sum+=fabs(i-k)+fabs(j-l);
            			break;
            		}
            	}
            }
        }
    }
    return sum;
}

bool flag;
int dr[4][2]={-1,0,0,-1,0,1,1,0};
int q;

void dfs(int x,int y,int last,int now,int step){
	int h=geth();
	if(now<=step){
		if(h==0){
			flag=true;
			q=now;
			return;
		}else if(now==step) return;
	}
	int nx,ny;
	for(int i=0;i<4;++i){
		if(i+last==3&&now>0) continue;
		nx=x+dr[i][0];
		ny=y+dr[i][1];
		if(nx>=1&&nx<=3&&ny>=1&&ny<=3){
			swap(maze[x][y],maze[nx][ny]);
			if(geth()+now<=step && !flag){
				dfs(nx,ny,i,now+1,step);
				if(flag) return;
			}
			swap(maze[x][y],maze[nx][ny]);
		}
	}
	
}

int main(){
	int i,j;
	int st,se;
	for(i=1;i<=3;++i)
		for(j=1;j<=3;++j){
			scanf("%c",&maze[i][j]);
			a[ai++]=maze[i][j];
			if(maze[i][j]=='.'){
				st=i,se=j;
			}
		}
	getchar();
	for(i=1;i<=3;++i)
		for(j=1;j<=3;++j){
			scanf("%c",&ans[i][j]);
			b[bi++]=ans[i][j];
		}
	if(!isjie()){
		puts("-1");
		return 0;
	}
	int dep=1;
	while(1){
		flag=false;
  		dfs(st,se,0,0,dep);
		if(flag){
			printf("%d\n",q);
			break;
		}
		++dep;
	}
    return 0;
}