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1. The variable name "1num" is invalid because variable names cannot start with a number. It is better to use a name like "balance" instead.
2. The input prompt message is missing quotation marks around it. It should be enclosed in quotation marks for it to be treated as a string.
3. The ending parenthesis is missing after the input statement, causing a syntax error. The pair of parentheses should be included at the end of the statement.
Corrected line of code:
balance = input("What is your balance?")