Write a programin C which reads as input a natural number n and then prints a triangle like pattern withletters as it is shown below. The height of the triangle $($number of rows$)$ will be n$.$ Trace the code $($showhow the value of the variables change for each iteration$)$ for an input greater than $3.$If the input is $7,$ the output is as follows:AB CD E FG H I JK L M N OP Q R S T UV W X Y Z A B