#include <bits/stdc++.h> using namespace std; int main () { int n,a,b,i,v[101]; cin>>n; for(i=1;i<=n;i++) cin>>v[i]; for(i=1;i<n;i++) { a=v[i]+1; b=v[i+1]-1; if(a<=b) cout<<a<<"-"<<b<<endl; } a=v[n]+1; if(a<=100) cout<<a<<"-"<<100; }