
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
Compute the least possible value of  $ABCD - AB \times CD$ , where  $ABCD$  is a 4-digit positive integer, and  $AB$  and  $CD$  are 2-digit positive integers.  (Here  $A$ ,  $B$ ,  $C$ , and  $D$  are digits, possibly equal.  Neither  $A$  nor  $C$  can be zero.)

Present the answer in LaTex format: \boxed{Your answer}
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