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Load Successfully

deep I'm a student of computer science , I want you to help me with my assignment. I have 10 different url I want to load on responsive Iframe, the iframe will full the screen of Any device either phone or PC, 1 out of the 10 URL will randomly load on the iframe, after 15 to 30 seconds another URL should load, after the third URL load successfully generate a codeatr the top of the ifame in green color load successfully, I want the iframe to be responsive and automatically adjust to the browser window size, Generate random Code at the top of the page each iframe when the URL loaded, before each iframe load add some random chars "a - z A - Z and 0 - 9" in the following format 'IwZXh0bgNhZW0CMTEAAR36Ep7rH5agWvLfGakoJAjtvAnwakzg7sz_ak3Zvc6MnYgwPj9DX4WA6Y4_aem_TssO-y56F4MbdsnFF_ViwQ' to the URL, don't change the position of _aem_ URL to each iframe