Problem: This is the hard version of the problem. The difference is the constraint on the sum of lengths of strings and the number of test cases. You can make hacks only if you solve all versions of this task.

You are given a string s, consisting of lowercase English letters. Find the longest string, t, which satisfies the following conditions: 

  * The length of t does not exceed the length of s. 
  * t is a palindrome. 
  * There exists two strings a and b (possibly empty), such that t = a + b ( "+" represents concatenation), and a is prefix of s while b is suffix of s. 

Input

The input consists of multiple test cases. The first line contains a single integer t (1 ≤ t ≤ 10^5), the number of test cases. The next t lines each describe a test case.

Each test case is a non-empty string s, consisting of lowercase English letters.

It is guaranteed that the sum of lengths of strings over all test cases does not exceed 10^6.

Output

For each test case, print the longest string which satisfies the conditions described above. If there exists multiple possible solutions, print any of them.

Example

Input


5
a
abcdfdcecba
abbaxyzyx
codeforces
acbba


Output


a
abcdfdcba
xyzyx
c
abba

Note

In the first test, the string s = "a" satisfies all conditions.

In the second test, the string "abcdfdcba" satisfies all conditions, because:

  * Its length is 9, which does not exceed the length of the string s, which equals 11. 
  * It is a palindrome. 
  * "abcdfdcba" = "abcdfdc" + "ba", and "abcdfdc" is a prefix of s while "ba" is a suffix of s. 



It can be proven that there does not exist a longer string which satisfies the conditions.

In the fourth test, the string "c" is correct, because "c" = "c" + "" and a or b can be empty. The other possible solution for this test is "s".

Solution (in JAVA):

Solution:
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.StringTokenizer;

public class Main {

    public static void main(String[] args) throws Exception {
        long startTime = System.nanoTime();
        solve();
        long endTime = System.nanoTime();
        err.println("Execution Time : +" + (endTime - startTime) / 1000000 + " ms");
        exit(0);
    }

    static void solve() {
        int t = in.nextInt();
        while (t-- > 0) {
            String s = in.next();
            int ans = 0;
            for (int i = 0, j = s.length() - 1; i < s.length(); i++, j--) {
                if (s.charAt(i) == s.charAt(j)) {
                    ans++;
                    continue;
                } else {
                    break;
                }
            }

            if (ans == s.length()) {
                out.println(s);
                continue;
            }
            String s1 = "";
            if (ans > 0) {
                s1 = s.substring(ans,s.length() - ans);
            } else {
                s1 = s;
            }
            char[] c = constructReverseWithHash(s1);
            int[] pi = prefix_function(c);
            String first = constructStringFromChars(c, 0, pi[pi.length - 1]);
            String s2 = "";
            if (ans > 0) {
                s2 = s.substring(ans,s.length() - ans);
            } else {
                s2 = s;
            }
            char[] temp = ArrayUtils.reverse(s2.toCharArray());
            char[] d = constructReverseWithHash(constructStringFromChars(temp, 0, temp.length));
            pi = prefix_function(d);
            String second = constructStringFromChars(d, 0, pi[pi.length - 1]);
            List<String> sol = Arrays.asList(first, second);
            Collections.sort(sol, Comparator.comparingInt(String::length));
            Collections.reverse(sol);
            String res = "";
            if (ans > 0) {
                res += s.substring(0, ans);
            }
            if (!sol.isEmpty()) {
                res += sol.get(0);
            }
            if (ans > 0) {
                res += s.substring(s.length() - ans);
            }
            out.println(res);
        }
    }

    static char[] constructReverseWithHash(String s) {
        char[] a = s.toCharArray();
        char[] b = ArrayUtils.reverse(s.toCharArray());
        char[] c = new char[a.length + b.length + 1];
        System.arraycopy(a, 0, c, 0, a.length);
        c[a.length] = '#';
        System.arraycopy(b, 0, c, a.length + 1, b.length);
        return c;
    }

    static String constructStringFromChars(char[] d, int from, int to) {
        StringBuilder res = new StringBuilder();
        for (int i = from; i < to; i++) {
            res.append(d[i]);
        }
        return res.toString();
    }

    static String constructStringFromInts(int[] d, int from, int to) {
        StringBuilder res = new StringBuilder();
        for (int i = from; i < to; i++) {
            res.append(d[i]);
        }
        return res.toString();
    }

    static int[] prefix_function(char[] s) {
        int n = s.length;
        int[] pi = new int[n];
        for (int i = 1; i < n; i++) {
            int j = pi[i - 1];
            while (j > 0 && s[i] != s[j])
                j = pi[j - 1];
            if (s[i] == s[j]) {
                j++;
            }
            pi[i] = j;
        }
        return pi;
    }

    static class NumberTheory {

        static ArrayList<Integer>[] getDivisors(int n) {
            ArrayList<Integer>[] d = new ArrayList[n + 1];
            for (int i = 1; i <= n; i++) {
                d[i] = new ArrayList<>();
            }
            for (int i = 1; i <= n; i++) {
                for (int j = i; j <= n; j += i) {
                    d[j].add(i);
                }
            }
            return d;
        }

        static long mod_pow(long x, long y, long MOD) {
            if (y == 0) {
                return 1;
            }
            if (y == 1) {
                return x;
            }
            long v = mod_pow(x, y / 2, MOD);
            if ((y & 1) > 0) {
                return v * v % MOD * x % MOD;
            }
            return v * v % MOD;
        }

        static int gcd(int a, int b) {
            while (b != 0) {
                int t = b;
                b = a % b;
                a = t;
            }
            return a;
        }

        //GCD Long
        static long gcd(long a, long b) {
            while (b != 0) {
                long t = b;
                b = a % b;
                a = t;
            }
            return a;
        }

    }

    static class ArrayUtils {

        static int[] reverse(int[] data) {
            int[] p = new int[data.length];
            for (int i = 0, j = data.length - 1; i < data.length; i++, j--) {
                p[i] = data[j];
            }
            return p;
        }

        static char[] reverse(char[] data) {
            char[] p = new char[data.length];
            for (int i = 0, j = data.length - 1; i < data.length; i++, j--) {
                p[i] = data[j];
            }
            return p;
        }

        static int[] MegreSort(int[] A) {
            if (A.length > 1) {
                int q = A.length / 2;
                int[] left = new int[q];
                int[] right = new int[A.length - q];
                System.arraycopy(A, 0, left, 0, q);
                System.arraycopy(A, q, right, 0, A.length - q);
                int[] left_sorted = MegreSort(left);
                int[] right_sorted = MegreSort(right);
                return Megre(left_sorted, right_sorted);
            } else {
                return A;
            }
        }

        static int[] Megre(int[] left, int[] right) {
            int[] A = new int[left.length + right.length];
            int i = 0;
            int j = 0;
            for (int k = 0; k < A.length; k++) {
                // To handle left becoming empty
                if (i == left.length && j < right.length) {
                    A[k] = right[j];
                    j++;
                    continue;
                }
                // To handle right becoming empty
                if (j == right.length && i < left.length) {
                    A[k] = left[i];
                    i++;
                    continue;
                }
                if (left[i] <= right[j]) {
                    A[k] = left[i];
                    i++;
                } else {
                    A[k] = right[j];
                    j++;
                }
            }
            return A;
        }

        static long[] MegreSort(long[] A) {
            if (A.length > 1) {
                int q = A.length / 2;
                long[] left = new long[q];
                long[] right = new long[A.length - q];
                System.arraycopy(A, 0, left, 0, q);
                System.arraycopy(A, q, right, 0, A.length - q);
                long[] left_sorted = MegreSort(left);
                long[] right_sorted = MegreSort(right);
                return Megre(left_sorted, right_sorted);
            } else {
                return A;
            }
        }

        static long[] Megre(long[] left, long[] right) {
            long[] A = new long[left.length + right.length];
            int i = 0;
            int j = 0;
            for (int k = 0; k < A.length; k++) {
                // To handle left becoming empty
                if (i == left.length && j < right.length) {
                    A[k] = right[j];
                    j++;
                    continue;
                }
                // To handle right becoming empty
                if (j == right.length && i < left.length) {
                    A[k] = left[i];
                    i++;
                    continue;
                }
                if (left[i] <= right[j]) {
                    A[k] = left[i];
                    i++;
                } else {
                    A[k] = right[j];
                    j++;
                }
            }
            return A;
        }
    }

    static class InputReader {
        public BufferedReader reader;
        public StringTokenizer tokenizer;

        public InputReader(InputStream stream) {
            reader = new BufferedReader(new InputStreamReader(stream), 32768);
            tokenizer = null;
        }

        public String next() {
            while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            return tokenizer.nextToken();
        }

        public long nextLong() {
            return Long.parseLong(next());
        }

        public int nextInt() {
            return Integer.parseInt(next());
        }

        public int[] readAllInts(int n) {
            int[] p = new int[n];
            for (int i = 0; i < n; i++) {
                p[i] = in.nextInt();
            }
            return p;
        }

        public int[] readAllInts(int n, int s) {
            int[] p = new int[n + s];
            for (int i = s; i < n + s; i++) {
                p[i] = in.nextInt();
            }
            return p;
        }

        public double nextDouble() {
            return Double.parseDouble(next());
        }
    }

    static void exit(int a) {
        out.close();
        err.close();
        System.exit(a);
    }

    static InputStream inputStream = System.in;
    static OutputStream outputStream = System.out;
    static OutputStream errStream = System.err;
    static InputReader in = new InputReader(inputStream);
    static PrintWriter out = new PrintWriter(outputStream);
    static PrintWriter err = new PrintWriter(errStream);
    static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

}