London, Aug 13 : Olympic silver medallist in the women's 800metres, Caster Semenya, has said she will put all her efforts over the next four years into winning gold at the 2016 Olympic Games in Rio de Janeiro.

Semenya won South Africa's sixth medal at the London Games, finishing second behind Russia''s Mariya Savinova.

"I am happy with a silver medal in my first Olympics. Now, I just have to concentrate to win the next Olympics. Four years is not easy, but I''ll just have to go back and concentrate, so that I can do it again," said Semenya.

The 21-year-old said she was disappointed that she had left her attack too late in the race.

She held back until the final 200m with Savinova well ahead of her, Sport24 reports.

When Semenya kicked, with 70m to go, Savinova already had a sizeable lead and the South African unable to catch her.

"I knew I had a better kick but, unfortunately, I made a late move but I am very happy with the silver medal. I tried hard to get back there but the body wasn''t really on fire today, and I had to fight until the end," she said.

Before the Olympics in the English capital, Semenya only managed to dip below two minutes on two occasions.

However, she produced peak performances at these Games, running a season''s best time of one minute, 57.23 seconds (1:57.23) on Saturday night.

Semenya said she had put the 2009 gender-testing debacle behind her and would let the coach guide her to greater heights. (ANI)