#pragma GCC target("avx2") #pragma GCC optimize("O3") #pragma GCC optimize("unroll-loops") #include #define ll long long #define ld long double #define rep(i, n) for(ll i = 0; i < n; ++i) #define rep2(i, a, b) for(ll i = a; i <= b; ++i) #define rrep(i, a, b) for(ll i = a; i >= b; --i) #define pii pair #define pll pair #define fi first #define se second #define pb push_back #define eb emplace_back #define vi vector #define vll vector #define vpii vector #define vpll vector #define all(a) a.begin(), a.end() #define rall(a) a.rbegin(), a.rend() #define endl '\n' using namespace std; template inline bool chmax(T& a, T b) { if (a < b) { a = b; return true; } return false; } template inline bool chmin(T& a, T b) { if (a > b) { a = b; return true; } return false; } const int MOD=1000000007;//998244353 const ll INF=1e18; const int inf=1e9; const double PI=acos(-1); int dx[8] = {1,0,-1,0,1,1,-1,-1}; int dy[8] = {0,1,0,-1,-1,1,1,-1}; const int MAX = 310000; template struct Fp { long long val; constexpr Fp(long long v = 0) noexcept : val(v % MOD) { if (val < 0) val += MOD; } constexpr int getmod() { return MOD; } constexpr Fp operator - () const noexcept { return val ? MOD - val : 0; } constexpr Fp operator + (const Fp& r) const noexcept { return Fp(*this) += r; } constexpr Fp operator - (const Fp& r) const noexcept { return Fp(*this) -= r; } constexpr Fp operator * (const Fp& r) const noexcept { return Fp(*this) *= r; } constexpr Fp operator / (const Fp& r) const noexcept { return Fp(*this) /= r; } constexpr Fp& operator += (const Fp& r) noexcept { val += r.val; if (val >= MOD) val -= MOD; return *this; } constexpr Fp& operator -= (const Fp& r) noexcept { val -= r.val; if (val < 0) val += MOD; return *this; } constexpr Fp& operator *= (const Fp& r) noexcept { val = val * r.val % MOD; return *this; } constexpr Fp& operator /= (const Fp& r) noexcept { long long a = r.val, b = MOD, u = 1, v = 0; while (b) { long long t = a / b; a -= t * b; swap(a, b); u -= t * v; swap(u, v); } val = val * u % MOD; if (val < 0) val += MOD; return *this; } constexpr bool operator == (const Fp& r) const noexcept { return this->val == r.val; } constexpr bool operator != (const Fp& r) const noexcept { return this->val != r.val; } friend constexpr ostream& operator << (ostream &os, const Fp& x) noexcept { return os << x.val; } friend constexpr Fp modpow(const Fp &a, long long n) noexcept { if (n == 0) return 1; auto t = modpow(a, n / 2); t = t * t; if (n & 1) t = t * a; return t; } }; using mint = Fp; signed main(){ cin.tie(0); ios::sync_with_stdio(false); string s = "abcdefghijklmnopqrstuvwxyz"; string t; cin >> t; rep(i,26){ if(s[i] != t[i]){ cout << s[i] << "to" << t[i] << endl; return 0; } } return 0; }