def solve(s):
    new_word = ""
    word_start = True  # To track the start of a new word

    for char in s:
        if char != " " and word_start:  # If it's a non-space and start of a word
            if 'a' <= char <= 'z':  # Check if char is a lowercase letter
                new_word += char.upper()  # Convert to uppercase
            else:
                new_word += char  # Keep the character unchanged
            word_start = False  # Set flag to False after first letter
        else:
            new_word += char     
        if char == " ":  # Reset flag when encountering a space
            word_start = True  

    return new_word