#include<stdio.h>
#include<string.h>
char s1[100]="36?1?8";
char s2[100]="236428";
int num[100];
int ans;
int length;
/*

23??3?9
2341723
  */
power(int n)
{
int a;
int sum=1;
for(a=1;a<=n;a++)sum*=10;

return sum;


}


fun(int n)
{
if(n==length)return;


if(s1[n]!='?')
{	if(s1[n]>s2[n]){ans+=power(num[n]); }
else if(s1[n]==s2[n]){  fun(n+1);     }
else {  }

}

else
{

ans+=('9'-s2[n])*power(num[n]);

fun(n+1);

};



}

int main()
{int a;

while(gets(s1),strcmp(s1,"#")!=0)
	{	
gets(s2);
length=strlen(s1);
num[length-1]=0;
for(a=length-2;a>=0;a--)  num[a]=num[a+1]+(s1[a+1]=='?') ;
ans=0;
fun(0);
printf("%d\n",ans);
	}

}