Li Ming was a young man in 1977, his age at that time was just equal to the sum of the numbers of his birth year, so what is his birth year?
李明在1977年是一个年轻的小伙子，他那时的年龄刚好等于他出生年份的各个数字之和，那么他的出生年份是多少？
<result>1_956</result>