# Task 2: Reverse Prefix
# Submitted by: Mohammad Sajid Anwar
# 
# You are given a string, $str and a character in the given string, $char.
# Write a script to reverse the prefix upto the first occurrence of the given $char in the given string $str and return the new string.
# 
# Example 1
# Input: $str = "programming", $char = "g"
# Output: "gorpmming"
# 
# Reverse of prefix "prog" is "gorp".
# 
# Example 2
# Input: $str = "hello", $char = "h"
# Output: "hello"
# 
# Example 3
# Input: $str = "abcdefghij", $char = "h"
# Output: "hgfedcbaj"
# 
# Example 4
# Input: $str = "reverse", $char = "s"
# Output: "srevere"
# 
# Example 5
# Input: $str = "perl", $char = "r"
# Output: "repl"

def reverse_prefix(str, char):
    strings = list(str)
    new_str = ''
    for n in (range(len(str))):
        letter = strings.pop(0);
        new_str += letter
        if letter == char:
            new_str = new_str[::-1]
            break
    new_str += ''.join( strings )

    print("'%s' '%s' -> '%s'" % (str, char, new_str) )

if __name__ == "__main__":
    str = "programming"
    char = "g"
    reverse_prefix( str, char )

    str = "hello"
    char = "h"
    reverse_prefix( str, char )

    str = "abcdefghij"
    char = "h"
    reverse_prefix( str, char )

    str = "reverse"
    char = "s"
    reverse_prefix( str, char )

    str = "perl"
    char = "r"
    reverse_prefix( str, char )