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STEP 7 / STEP 7 Lite: Retrieve the four Towards characters From string

Hi,
Urgent help, anybody knows how i can get the four first characters of a string, the idea is compare this characters for a data base. sometimes the string is small than the others, like the example.
the string is declared: string[52]
0001
-2556MX/2
0002
-12457l
Thanks in advance!

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