#include<string>
#include<iostream>
#include<algorithm>
#include<stdlib.h> 
using namespace std;
char in[100], out[100];

string s1, s2;
int main(){
	int n, i, I;
	for(I = 1 ; I < 21 ; I++){
		int ans = 0;
		//cin >> n;
		n = I * 5;
		//cin >> s1 >> s2;
		s1="";
		s2="";
		sprintf(in,".%d.in",I);
        freopen(in,"w",stdout);
		for(i=0;i<n;i++){
			char c;
			c = rand()%10+'0';
			s1 = s1+ c;
			c = rand()%10+'0';
			s2 = s2+ c;
		}
		cout<<n<<"\n"<<s1<<"\n"<<s2<<"\n";
		
		
        
		for(i=0;i<n;i++) ans += min(abs(s1[i]-s2[i]),10-abs(s1[i]-s2[i]));
		
		sprintf(in,".%d.out",I);
        freopen(in,"w",stdout);
		cout << ans << "\n";
	}
}