[Tutor] Consecutive Sequence

[syed zaidi]

Hi,I am trying to develop a python code that takes a character string as input and  finds for the occurrence of letters that are occurring thrice or more consecutively.For E.g.
a = 'atttttaattaaacagagtgagcagaaaat'In the output I want a list of those characters that are occuring thrice or more.
like in this case outout must b out_put = ['ttttt','aaa','aaaa']
Can someone please suggest a code for this. 		 	   		  
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