UART for OpenThread CLI sample not responding.

Hello, I'm trying to run the OpenThread CLI example on the nrf52840 chip of my NRF9160_DK. I've managed to flash the code on the nrf52 and able to see the Zephyr kernel boot log information on the serial monitor. Unfortunately, I'm not able to give any input on the serial monitor. Any help will be greatly appreciated. 

Regards,

Ameer

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