def f(l):[p,q,c]=l.split();return[int(p),int(q),c]
e=list(map(f,open(0)))
x=[r[0]for r in e]
y=[r[1]for r in e]
a,b,c,d=min(x),min(y),max(x)+1,max(y)+1
g={(r[0],r[1]):r[2]for r in e}
for i in range(b,d):
for j in range(a,c):
print(g.get((j,i),'-'),end='')
print()
Note that non-ascii characters in the above source code will be escaped (such as \x9f).