def migratoryBirds(arr):
    # Write your code here
    
    mydict = {}
    
    for i in arr:
        if i in mydict:
            mydict[i] += 1
        else:
            mydict[i] = 1
            
    max_count = max(mydict.values())
    
    req_list = [key for key, value in mydict.items() if value == max_count]
    req_list.sort()
    
    return req_list[0]