n=int(input())
a=list(map(int,input().split()))+[0]
M=998244353
q=[(a[i],i) for i in range(n)]
q.sort()
w=[[0,0] for i in range(n)]
p=[[] for i in range(n+1)]
X=10**10
a[-1]=X
ql=[-1]
for i in range(n):
  while a[ql[-1]]<a[i]:
    ql.pop()
  w[i][0]=ql[-1]+1
  ql+=[i]
qr=[n]
for i in reversed(range(n)):
  while a[qr[-1]]<a[i]:
    qr.pop()
  w[i][1]=qr[-1]-1
  qr+=[i]
for i in range(n):
  v=a[i]
  l,r=w[i]
  p[i]+=[(l,i,v)]
  p[r+1]+=[(l,i,pow(v,M-2,M))]
a[-1]=-X
ql=[-1]
for i in range(n):
  while a[ql[-1]]>a[i]:
    ql.pop()
  w[i][0]=ql[-1]+1
  ql+=[i]
qr=[n]
for i in reversed(range(n)):
  while a[qr[-1]]>a[i]:
    qr.pop()
  w[i][1]=qr[-1]-1
  qr+=[i]
for i in range(n):
  v=a[i]
  l,r=w[i]
  p[i]+=[(l,i,v)]
  p[r+1]+=[(l,i,pow(v,M-2,M))]
ans=0
B=448
st1=[1]*B*B
st2=[B]*B
lt=[1]*B
for y in range(n):
  for l,r,v in p[y]:
    yl=l//B
    yr=r//B
    if lt[yl]!=1:
      for i in range(yl*B,yl*B+B):
        st1[i]*=lt[yl]
        st1[i]%=M
      lt[yl]=1
    if lt[yr]!=1:
      for i in range(yr*B,yr*B+B):
        st1[i]*=lt[yr]
        st1[i]%=M
      lt[yr]=1
    if yl==yr:
      for i in range(l,r+1):
        st2[yl]-=st1[i]
        st1[i]*=v
        st1[i]%=M
        st2[yl]+=st1[i]
        st2[yl]%=M
    else:
      for i in range(l,yl*B+B):
        st2[yl]-=st1[i]
        st1[i]*=v
        st1[i]%=M
        st2[yl]+=st1[i]
        st2[yl]%=M
      for i in range(yl+1,yr):
        st2[i]*=v
        st2[i]%=M
        lt[i]=v
      for i in range(yr*B,r+1):
        st2[yr]-=st1[i]
        st1[i]*=v
        st1[i]%=M
        st2[yr]+=st1[i]
        st2[yr]%=M
  g=0
  l=0
  r=y
  yl=l//B
  yr=r//B
  if lt[yl]!=1:
    for i in range(yl*B,yl*B+B):
      st1[i]*=lt[yl]
      st1[i]%=M
    lt[yl]=1
  if lt[yr]!=1:
    for i in range(yr*B,yr*B+B):
      st1[i]*=lt[yr]
      st1[i]%=M
    lt[yr]=1
  if yl==yr:
    g+=sum(st1[l:r+1])
  else:
    g+=sum(st1[l:yl*B+B])
    g+=sum(st2[yl+1:yr])
    g+=sum(st1[yr*B:r+1])
  ans+=g
  ans%=M
print(ans)