Display Escape Sequences

Source: Kernighan & Ritchie

Version: Phuoc Hung OJ Extended

Problem Statement

Read text to EOF. Replace each actual tab by the two printable characters backslash+t, each actual newline by backslash+n, and each actual backslash by two backslashes. Preserve other characters and do not reprocess produced output. The original K&R 1-10 uses backspace; the newline rule is specific to this PHOJ adaptation.

Input

UTF-8 text up to 100000 bytes, excluding CR, possibly empty or not newline-terminated.

Output

Print the visible escaped stream without adding a newline.

Subtasks

• Subtask 1 (20%): UTF-8 stream length at most 100 bytes, no CR.

• Subtask 2 (30%): UTF-8 stream length at most 2000 bytes, no CR.

• Subtask 3 (50%): UTF-8 stream length at most 100000 bytes, no CR.

Examples

Example 1

Input:

A	B
C\D

Output:

A\tB\nC\\D

Explanation:

Actual tab, newline and backslash are escaped once; produced characters are not processed again. Actual escaped input: "A\tB\nC\\D"; escaped output: "A\\tB\\nC\\\\D".

Example 2

Input:

\t

Output:

\\t

Explanation:

Actual tab, newline and backslash are escaped once; produced characters are not processed again. Actual escaped input: "\\t"; escaped output: "\\\\t".

Example 3

Input:

Output:

Explanation:

Actual tab, newline and backslash are escaped once; produced characters are not processed again. Actual escaped input: ""; escaped output: "".

The quoted forms below use \t for a literal tab, \n for an LF, and \ for a literal backslash; they describe the actual byte stream, not additional characters in input.