Language: C++

import java.io.IOException;
import java.io.InputStream;
import java.util.NoSuchElementException;

public class Main {

	public static void main(String[] args) {
		FastScanner sc = new FastScanner();
		String S = sc.next();

		int N = S.length();
		for (int i = 1; i <= N; i++)
			System.out.print("x");

	}

	//以下、自作ライブラリ

	/*
		int N = sc.nextInt();

		int[] a = new int[N];
		for (int i = 0; i < N; i++)
			a[i] = sc.nextInt();

		String s = sc.next();

		String[] a = new String[N];
		for (int i = 0; i < N; i++)
			a[i] = sc.next();

		int[][] a = new int[N][2];
		for (int i = 0; i < N; i++) {
			a[i][0] = sc.nextInt();
			a[i][1] = sc.nextInt();
		}
		Arrays.sort(a, (x, y) -> Integer.compare(x[0], y[0]));

		List<Integer> list = new ArrayList<>();

		Set<Integer> set = new HashSet<>();

		Map<Integer, Integer> map = new HashMap<>();

		nextLineのときは
		Scanner sc = new Scanner(System.in);
	 */

	//階乗
	public static int fact(int n) {
		if (n == 1 || n == 0)
			return 1;
		else
			return n * fact(n - 1);
	}

	//指定した値以上の要素が最初に現れる位置
	//要素の数は+1（配列のズレ)
	public static long lowerBound(int n, long[] x, long y) {
		int left = 0;
		int right = n;
		while (left < right) {
			int mid = (left + right) / 2;
			if (x[mid] < y) {
				left = mid + 1;
			} else {
				right = mid;
			}
		}
		return left;
	}

	//指定した値より大きい要素が最初に現れる位置
	//要素の数は+1（配列のズレ)
	public static long upperBound(int n, long[] x, long y) {
		int left = 0;
		int right = n;
		while (left < right) {
			int mid = (left + right) / 2;
			if (x[mid] <= y) {
				left = mid + 1;
			} else {
				right = mid;
			}
		}
		return left;
	}

	//最大公約数
	public static long gcd(long a, long b) {
		if (a < b)
			return gcd(b, a);
		long c = 0;
		c = a % b;
		if (c == 0)
			return b;
		return gcd(b, c);
	}

	//最小公倍数
	public static long lcm(long m, long n) {
		return m * n / gcd(m, n);
	}

	//素数判定
	public static boolean isPrime(int n) {
		if (n < 2)
			return false;
		if (n == 2)
			return true;
		if (n % 2 == 0)
			return false;

		for (int i = 3; i * i <= n; i += 2) {
			if (n % i == 0)
				return false;
		}
		return true;
	}
}

//以下、高速スキャナークラス
class FastScanner {
	private final InputStream in = System.in;
	private final byte[] buffer = new byte[1024];
	private int ptr = 0;
	private int buflen = 0;

	private boolean hasNextByte() {
		if (ptr < buflen) {
			return true;
		} else {
			ptr = 0;
			try {
				buflen = in.read(buffer);
			} catch (IOException e) {
				e.printStackTrace();
			}
			if (buflen <= 0) {
				return false;
			}
		}
		return true;
	}

	private int readByte() {
		if (hasNextByte())
			return buffer[ptr++];
		else
			return -1;
	}

	private static boolean isPrintableChar(int c) {
		return 33 <= c && c <= 126;
	}

	public boolean hasNext() {
		while (hasNextByte() && !isPrintableChar(buffer[ptr]))
			ptr++;
		return hasNextByte();
	}

	public String next() {
		if (!hasNext())
			throw new NoSuchElementException();
		StringBuilder sb = new StringBuilder();
		int b = readByte();
		while (isPrintableChar(b)) {
			sb.appendCodePoint(b);
			b = readByte();
		}
		return sb.toString();
	}

	public long nextLong() {
		if (!hasNext())
			throw new NoSuchElementException();
		long n = 0;
		boolean minus = false;
		int b = readByte();
		if (b == '-') {
			minus = true;
			b = readByte();
		}
		if (b < '0' || '9' < b) {
			throw new NumberFormatException();
		}
		while (true) {
			if ('0' <= b && b <= '9') {
				n *= 10;
				n += b - '0';
			} else if (b == -1 || !isPrintableChar(b)) {
				return minus ? -n : n;
			} else {
				throw new NumberFormatException();
			}
			b = readByte();
		}
	}

	public int nextInt() {
		long nl = nextLong();
		if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE)
			throw new NumberFormatException();
		return (int) nl;
	}

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


Compiler output:
a.cc:1:1: error: 'import' does not name a type
    1 | import java.io.IOException;
      | ^~~~~~
a.cc:1:1: note: C++20 'import' only available with '-fmodules-ts'
a.cc:2:1: error: 'import' does not name a type
    2 | import java.io.InputStream;
      | ^~~~~~
a.cc:2:1: note: C++20 'import' only available with '-fmodules-ts'
a.cc:3:1: error: 'import' does not name a type
    3 | import java.util.NoSuchElementException;
      | ^~~~~~
a.cc:3:1: note: C++20 'import' only available with '-fmodules-ts'
a.cc:5:1: error: expected unqualified-id before 'public'
    5 | public class Main {
      | ^~~~~~
a.cc:124:16: error: expected ':' before 'final'
  124 |         private final InputStream in = System.in;
      |                ^~~~~~
      |                :
a.cc:124:17: error: 'final' does not name a type
  124 |         private final InputStream in = System.in;
      |                 ^~~~~
a.cc:125:16: error: expected ':' before 'final'
  125 |         private final byte[] buffer = new byte[1024];
      |                ^~~~~~
      |                :
a.cc:125:17: error: 'final' does not name a type
  125 |         private final byte[] buffer = new byte[1024];
      |                 ^~~~~
a.cc:126:16: error: expected ':' before 'int'
  126 |         private int ptr = 0;
      |                ^~~~
      |                :
a.cc:127:16: error: expected ':' before 'int'
  127 |         private int buflen = 0;
      |                ^~~~
      |                :
a.cc:129:16: error: expected ':' before 'boolean'
  129 |         private boolean hasNextByte() {
      |                ^~~~~~~~
      |                :
a.cc:129:17: error: 'boolean' does not name a type; did you mean 'bool'?
  129 |         private boolean hasNextByte() {
      |                 ^~~~~~~
      |                 bool
a.cc:146:16: error: expected ':' before 'int'
  146 |         private int readByte() {
      |                ^~~~
      |                :
a.cc:153:16: error: expected ':' before 'static'
  153 |         private static boolean isPrintableChar(int c) {
      |                ^~~~~~~
      |                :
a.cc:153:24: error: 'boolean' does not name a type; did you mean 'bool'?
  153 |         private static boolean isPrintableChar(int c) {
      |                        ^~~~~~~
      |                        bool
a.cc:157:15: error: expected ':' before 'boolean'
  157 |         public boolean hasNext() {
      |               ^~~~~~~~
      |               :
a.cc:157:16: error: 'boolean' does not name a type; did you mean 'bool'?
  157 |         public boolean hasNext() {
      |                ^~~~~~~
      |                bool
a.cc:163:15: error: expected ':' before 'String'
  163 |         public String next() {
      |               ^~~~~~~
      |               :
a.cc:163:16: error: 'String' does not name a type
  163 |         public String next() {
      |                ^~~~~~
a.cc:175:15: error: expected ':' before 'long'
  175 |         public long nextLong() {
      |               ^~~~~
      |               :
a.cc:201:15: error: expected ':' before 'int'
  201 |         public int nextInt() {
      |               ^~~~
      |               :
a.cc:208:15: error: expected ':' before 'double'
  208 |         public double nextDouble() {
      |               ^~~~~~~
      |               :
a.cc:211:2: error: expected ';' after class definition
  211 | }
      |  ^
      |  ;
a.cc: In member function 'int FastScanner::readByte()':
a.cc:147:21: error: 'hasNextByte' was not declared in this scope
  147 |                 if (hasNextByte())
      |                     ^~~~~~~~~~~
a.cc:148:32: error: 'buffer' was not declared in this scope; did you mean 'buflen'?
  148 |                         return buffer[ptr++];
      |                                ^~~~~~
      |                                buflen
a.cc: In member function 'long int FastScanner::nextLong()':
a.cc:176:22: error: 'hasNext' was not declared in this scope
  176 |                 if (!hasNext())
      |                      ^~~~~~~
a.cc:177:35: error: expected type-specifier before 'NoSuchElementException'
  177 |                         throw new NoSuchElementException();
      |                                   ^~~~~~~~~~~~~~~~~~~~~~
a.cc:179:17: error: 'boolean' was not declared in this scope; did you mean 'bool'?
  179 |                 boolean minus = false;
      |                 ^~~~~~~
      |                 bool
a.cc:182:25: error: 'minus' was not declared in this scope
  182 |                         minus = true;
      |                         ^~~~~
a.cc:186:35: error: expected type-specifier before 'NumberFormatException'
  186 |                         throw new NumberFormatException();
      |                                   ^~~~~~~~~~~~~~~~~~~~~
a.cc:192:48: error: 'isPrintableChar' was not declared in this scope
  192 |                         } else if (b == -1 || !isPrintableChar(b)) {
      |                                                ^~~~~~~~~~~~~~~
a.cc:193:40: error: 'minus' was not declared in this scope
  193 |                                 return minus ? -n : n;
      |                                        ^~~~~
a.cc:195:43: error: expected type-specifier before 'NumberFormatException'
  195 |                                 throw new NumberFormatException();
      |                                           ^~~~~~~~~~~~~~~~~~~~~
a.cc: In member function 'int FastScanner::nextInt()':
a.cc:203:26: error: 'Integer' was not declared in this scope
  203 |                 if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE)
      |                          ^~~~~~~
a.cc:204:35: error: expected type-specifier before 'NumberFormatException'
  204 |                         throw new NumberFormatException();
      |                                   ^~~~~~~~~~~~~~~~~~~~~
a.cc: In member function 'double FastScanner::nextDouble()':
a.cc:209:24: error: 'Double' was not declared in this scope; did you mean 'double'?
  209 |                 return Double.parseDouble(next());
      |                        ^~~~~~
      |                        double
a.cc:209:43: error: 'next' was not declared in this scope; did you mean 'nextInt'?
  209 |                 return Double.parseDouble(next());
      |                                           ^~~~
      |                                           nextInt