How to type the superscript and subscript of a number (letter)?

Superscript and subscript can be input by sogou input method, as shown below:

1. Switch the input method in the computer to sogou input method, and click the toolbox on the far left.

2. Click "Symbol Collection" in the upper right corner of the pop-up dialog box.

3. Select the column "Mathematics/Unit" in the interface, select the required subscript and superscript symbols on the right, and click to finish the input.

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