#include <array>
#include <iostream>
#include <string>
#include <vector>
using namespace std;
#define FOR(i, begin, end) for(int i=(begin),i##_end_=(end);i<i##_end_;i++)
#define IFOR(i, begin, end) for(int i=(end)-1,i##_begin_=(begin);i>=i##_begin_;i--)
#define REP(i, n) FOR(i,0,n)
#define IREP(i, n) IFOR(i,0,n)

#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,mmx,avx,avx2")

int main() {
    cin.tie(nullptr), ios::sync_with_stdio(false);
    string Si;
    cin >> Si;
    array<char, 26> s;
    
    FOR(n, 1, 27) {
        auto S = Si;
        bool failed = false;
        s.fill(0);
        s[0] = n;
        IREP(i, S.size()) {
            auto &c = S[i];
            if (c == '?') {
                int t = 0;
                while (!s[t]) t++;
                c = 'a' + t;
            } else {
                int j = c - 'a';
                while (j >= 0 and !s[j]) j--;
                if (j < 0) {
                    failed = true;
                    break;
                }
                s[j]--;
                s[c - 'a']++;
            }
        }
        if (!failed) {
            cout << S << '\n';
            return 0;
        }
    }
}