#include <iostream>
#include <string>
using namespace std;
int main() {
int t;
string s1,s2;
cin>>t;
int i,j;
for(i=1;i<=t;i++)
{
cout<<"Case #"<<i<<": ";
cin>>s1>>s2;
if(s1[0]=='?' && s2[0]=='?')
s1[0]=s2[0]='0';
else if(s1[0]=='?')
s1[0]=s2[0];
else if(s2[0]=='?')
s2[0]=s1[0];
for(j=1;j<s1.length();j++)
{
if(s1[j]=='?' && s2[j]=='?')
{
if(s1[j-1]==s2[j-1])
s1[j]=s2[j]='0';
else if(s1[j-1]>s2[j-1])
{
s1[j]='0';
s2[j]='9';
}
else
{
s2[j]='0';
s1[j]='9';
}
}
else if(s1[j]=='?')
{
if(s1[j-1]==s2[j-1])
s1[j]=s2[j];
else if(s1[j-1]>s2[j-1])
{
s1[j]='0';
}
else
{
s1[j]='9';
}
}
else if(s2[j]=='?')
{
if(s1[j-1]==s2[j-1])
s2[j]=s1[j];
else if(s1[j-1]>s2[j-1])
{
s2[j]='9';
}
else
{
s2[j]='0';
}
}
}
cout<<s1<<" "<<s2<<endl;
}
return 0;
}
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