a = "21 52 34 35 13 44 21 { 35 34 31 54 12 24 45 43 _ 43 41 45 11 42 15 }"
a = a.split()
apl=[["a","b","c","d","e"],
     ["f","g","h","i,j","k"],
     ["l","m","n","o","p"],
     ["q","r","s","t","u"],
     ["v","w","x","y","z"]]
for x in a:
    if x.isnumeric():
        print(apl[int(x[0])-1][int(x[1])-1], end="")
    else:
        print(x, end="")