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#include <iostream>
#include <string>
#include <math.h>
using namespace std;
void print_range(int, int, int);
int main(){
int n, c=0;
cin>>n;
while(n>0){
cout<<"Case "<<++c<<":\n";
int i, nums[100000];
for(i=0; i<n; i++)
cin>>nums[i];
int higher, lower, len=1, temp = nums[0];
while(temp /= 10)
len++;
for(i=0; i<n; i++){
if(nums[i+1]-nums[i]==1){
lower = nums[i];
while(nums[i+1]-nums[i]==1){
i++;
}
higher = nums[i];
print_range(lower, higher, len);
}
else
cout<<"0"<<nums[i]<<endl;
}
cout<<endl;
cin>>n;
}
}
void print_range(int lower, int higher, int len){
int i, k;
string num;
for(i=len-1; ; i--){
if(lower/int(pow(10.0,i)) != higher/int(pow(10.0,i)))
break;
}
for(k=len-(i+1); k<len; k++){
num += to_string(higher)[k];
}
cout<<"0"<<lower<<"-"<<num<<endl;
}
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