Add remaining digits of str2 [ ]
for i in range ( n2 - n1 - 1 , - 1 , - 1 ) : NEW_LINE INDENT sum = ( ( ord ( str2 [ i ] ) - ord ( '0' ) ) + carry ) NEW_LINE str3 = str3 + str ( sum % 10 ) NEW_LINE carry = sum // 10 NEW_LINE DEDENT