how are you
    Hello

1. Run-Length Encoding:

Input: string, consisting of symbols A-Z:
AAAABBBCCXYZDDDDEEEFFFAAAAAABBBBBBBBBBBBBBBBBBBBBBBBBBBB

You should write a function RLE, which will return string:
A4B3C2XYZD4E3F3A6B28

Explanation:
If a symbol occurs 1 time, it remains unchanged
If a symbol is repeated more than 1 time, the number of repetitions is added to it
If input string is not correct: throw exception

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def string_encoder(str):
    if len(str)<2:
        return str
    current char = str[0]
    char_arr_out = []
    current_count =1
    for char is str[1,-1]:
        if char < 'A' OR char > 'Z':
            # raise Exception()
            raise Exception()
        if char == current:
               count+=1
        else:
            append(char_arr_out,current)
            if(count > 1):
                append(char_arr_out,str(count))
            count=1
            current = char
    return char_arr_out


 string_encoder('AF')