Run macro on specific sheets

Hello, I have this code which formats specific cells on specific sheets, it works fine but when I use the Option Explicit argument if does not compile. How can I rewrite it so it compiles with Option Explicit? - Thanks.

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Khaled it works! I knew I had to declare Sheetlist I just did not know which option to use (Variant) and in one of my tries I had i as Integer but since the first was not declared VBA would not compile. Thanks.

Now here is another challenge I tried the code it compiles an runs fine but it return and error if one of the sheets is not found i.e.: I have Hoja1 but I don't have Sheet1. Sheet3 exists but the format would not change it as when it gets to the second sheet on the sheetlist it gives me the error message instead of probing for the next sheet name. How can we avoid this? What I am trying to do is have the same code run on Sheet1 OR Hoja1 OR Sheet3, etc. What's your suggestion on that?