J. R. Cash was born on February 26, 1932 in Kingsland, Arkansas, to Ray Cash and Carrie Cloveree (nee Rivers). He was the fourth of seven children, who were in birth order: Roy, Margaret Louise, Jack, J. R., Reba, Joanne, and Tommy (who also became a successful country artist). He was primarily of English and Scottish descent. As an adult he traced his surname to 11th-century Fife, after meeting with the then-laird of Falkland, Major Michael Crichton-Stuart.

On July 18, 1951, while in Air Force training, Cash met 17-year-old Vivian Liberto at a roller skating rink in her native San Antonio, Texas. They dated for three weeks until Cash was deployed to Germany for a three-year tour. During that time, the couple exchanged hundreds of pages of love letters. On August 7, 1954, one month after his discharge, they were married at St. Ann's Roman Catholic Church in San Antonio. The ceremony was performed by her uncle, Vincent Liberto. They had four daughters: Rosanne, Kathy, Cindy, and Tara. In 1961, Johnny moved his family to a hilltop home overlooking Casitas Springs, California, a small town south of Ojai on Highway 33. He had previously moved his parents to the area to run a small trailer park called The Johnny Cash Trailer Park. Johnny's drinking led to several run-ins with local law enforcement. Liberto later said that she had filed for divorce in 1966 because of Cash's severe drug and alcohol abuse, as well as constant touring, affairs with other women, and his close relationship with June Carter. Their four daughters were then raised by their mother.  Cash met singer June Carter, of the famed Carter Family while on tour, and the two became infatuated with each other. In 1968, 13 years after they first met backstage at the Grand Ole Opry, Cash proposed to June, during a live performance in London, Ontario. The couple married on March 1, 1968, in Franklin, Kentucky. They had one child together, John Carter Cash, born March 3, 1970.  Cash and Carter continued to work, raising their child, create music, and tour together for 35 years until June's death in May 2003. Throughout their marriage, June attempted to keep Cash off of amphetamines, often taking his drugs and flushing them down the toilet. June remained with him even throughout his multiple admissions for rehab treatment and years of drug abuse. After June's death, Cash believed that his only reason for living was his music. He died four months after her.

Using a quote from the above article, answer the following question: How did the stay in coontact
During that time, the couple exchanged hundreds of pages of love letters.