MATLAB: Processing sequences of images one by one

signal and image processing

Hi all, when I process sequences of image {1.png, 2.png, 3.png, ……….,120.png}, I noted that matlab program process them like Fig.1 below {1.png, 10.png, 100.png, 101.png, 102.png, 103.png…..}. how can I make matlab process these images like fig.2 {1.png, 2.png, 3.png, ……….,120.png}. Thank for your help
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