def priority(item):
    if item < 'a':
        # uppercase
        return ord(item)-38
    else:
        # lowercase
        return ord(item)-96

priorities = []
groups = []
with open("input.txt", "r") as f:
    group = 0
    for line in f.readlines():
        line = line.strip("\n")
        groups.append(line)
        if len(groups) == 3:
            for c in groups[0]:
                if c in groups[1] and c in groups[2]:
                    priorities.append(priority(c))
                    groups = []
                    break
print(sum(priorities))