Shrink it

One day, an interesting app suddenly appears on Ahmad's smart phone: Shrink It.

"Wow," he says, "let me try this new app."

Ahmad installs the app. A warning message appears: "This is a serious application. If you are not brave enough, do not enter. What comes next is your RESPONSIBILTY." Ahmad's interest and curiosity increases and, without hesitation, he presses ENTER...