#include <iostream>
#include <cstring>
#include <algorithm>
#include <queue>
#include <stack>
#include <vector>
#include <cmath>
#include <map>
#include <sstream>
#include <cstdio>
using namespace std;
typedef long long ll;
const int MAXN = 2e5 + 100;
int Data[MAXN];
void solve1(){
string s;
int x;
cin >> s;
int len = s.length();
for(int i=0;i<len;i++){
if(s[i] >= 'A' && s[i] <= 'Z') x = s[i] - 'A' + 1;
if(s[i] >= 'a' && s[i] <= 'z') x = s[i] - 'a' + 1;
Data[x] = 1;
}
char l = '0', r;
for(int i=1;i<=26;i++){
if(Data[i]){
r = i;
if(l == '0') l = i;
}
}
l += 'A' - 1;
r += 'A' - 1;
cout << l << "-" << r;
}
void solve2(){
string s;
int m;
map<int, int> mp;
getline(cin, s);
stringstream input(s);
while(input >> m){
mp[m] = 1;
}
cout << mp.size();
}
void solve3(){
int x;
cin >> x;
if(x & 1) x--;
cout << x;
}
int main(){
solve1();
solve2();
solve3();
return 0;
}