import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines
sys.setrecursionlimit(10 ** 7)

s = read().rstrip().decode()
al = [chr(ord('a') + i) for i in range(26)]
cnt = 0
for check in list(s):
    if check not in al:
        cnt += int(check)
print(cnt)