Table:
Grand Tour

2010

2011

2012

2013

2014

2015

Giro d'Italia

73

80

—

56

—

50

Tour de France

—

—

69

—

—

—

Vuelta a España

—

—

—

DNF

—

—

For the shown table, how many rows and columns are there? Provide the final answer in the JSON structure, using the format {"row_number": "m", "column_number": "n"}.

There are 4 rows and 7 columns in the table. So, the final answer is {"row_number": "4", "column_number": "7"}.