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#include <stdio.h>
#include <stdlib.h>
#include <string.h>

long long int K,I,Lu,Ru,V,Ld,Rd,MyCase,D,U;
int J;
char MyString[12];
long long int MyGCD(long long int A,long long int B)
{
  long long int MyTemp;
  while(A%B)
   {
     MyTemp=A;
     A=B;
     B=MyTemp%B;
   }
   return B;
}
/**
long long int MyLCM(long long int A ,long long int B)
{
    return (A*B)/(MyGCD(A,B));
}
* **/
long long int MyPow(long long int N)
{
    long long int MyTemp=1;
    while(N--)
    {
        MyTemp=MyTemp*10;
    }
    return MyTemp;
}
int main()
{
    while (EOF!=scanf("%d",&J))
    {
        if (J==-1)
            break;
        scanf("%s",MyString);
        I=strlen(MyString);
        if (J == 0)
        {
          V=atoi(MyString+2);
          U = MyPow(I - 2);
        }
        else
        {
          int K = I - 2 - J;
          MyString[2+K+J]='\0';
          Lu=atoi(MyString+2);
          MyString[2 + K] = '\0';
          Ru = atoi(MyString+2);
          Ld=MyPow(K);
          Rd=MyPow(I-2);
          V = Lu - Ru;
          U = Rd - Ld;
        }
        D = MyGCD(V, U);
        printf("Case %lld: %lld/%lld\n",++MyCase,V/D,U/D);    /* %I64d for Windows */
    }
    return 0;
}