"What's important is that you do not go insane. That's the part you can work on. I kept repeating: I will survive, I will survive," said a 90-year-old Holocaust survivor.

Greta Wienfeld Ferusic, who now lives in Sarajevo, had to yell her tattooed identification number, A9233, out for 10 full months every morning for lineups at Auschwitz.

The last time she yelled it was right before the Red Army arrived on Jan. 27, 1945, to liberate the concentration camp inmates. 

 According to the Associated Press, Ferusic said, "To physically survive is the easier part."

Ferusic was just 19 when she and her parents, two aunts and an uncle were taken from their homes and loaded on to a cargo train in April 1944.

Dr. Joseph Mengele personally took her from her mother.

Ferusic believes her survival is due to the Nazis's efforts to cover up their genocide by destryoying their crematorium as the Soviets drew closer. This gave Feursic the opportunity to tell authorities that she was sick. 

The result woud have been different prior to November 1944. 

Ferusic said, "Before November, if you would admit you are sick, there was only one place they would send you."

As luck would have it, German authorities had turned a barracks near the crematoriums into a hospital.

Three days before their liberation, hospitalized prisoners were informed that whoever could walk should move toward a waiting train for evacuation to the west.

Ferusic refused to do so and even convinced others to disobey orders.

The rest of her story looks like a movie.

No guard came into the hospital for a day. She went out to look for food wrapped in a blanket. She saw bodies in the snow, and she came across a Nazi soldier in one of the guards's room. The soldier ran, and she also saw a frozen pot of soup. 

When the Red Army arrived, she and the other survivors were fed. They weren't given too much food at once because so much at once could kill them. 

She weighed just 73 pounds. Eventually she got up to 95 pounds.

After returning home and looking for her family, she realized she was the sole survivor.