
    Design a function for the learning management system that simplifies student tracking codes by removing every second character from the original identifier, helping to generate more streamlined progress markers while maintaining unique student paths. The function should take a student's full learning path code as input and return a shortened version containing only characters from even-numbered positions (0-based indexing). The simplified code must preserve the essential pattern recognition capabilities needed for the adaptive learning platform.
    

    
def odd_values_string(str):
    """
    Design a function for the learning management system that simplifies student tracking codes by removing every second character from the original identifier, helping to generate more streamlined progress markers while maintaining unique student paths. The function should take a student's full learning path code as input and return a shortened version containing only characters from even-numbered positions (0-based indexing). The simplified code must preserve the essential pattern recognition capabilities needed for the adaptive learning platform.
    

    """
def odd_values_string(str):
    """
    Design a function for the learning management system that simplifies student tracking codes by removing every second character from the original identifier, helping to generate more streamlined progress markers while maintaining unique student paths. The function should take a student's full learning path code as input and return a shortened version containing only characters from even-numbered positions (0-based indexing). The simplified code must preserve the essential pattern recognition capabilities needed for the adaptive learning platform.
    

    """
    result = ''
    for i in range(len(str)):
        if i % 2 == 0:
            result = result + str[i]
    return result